The service has a slick Ajaxed interface & offers a complete analytics package with web stats, referring keywords, action/goals & more.

GoingUp! tracks every activity & presents data nicely with charts, heatmaps, flags (for countries), etc.

Some of its SEO features are:

• Inbound Link Monitoring
• Google Page Rank Tracking
• Alexa Rank Tracking
• Keyword Research
• Keyword Position Tracking
• Page Optimizer Tool
• Keyword Density Tool

The service also has some other free SEO tools like "bulk domain analyzer" or "link & SEO optimizer" which can be used directly without the need of signing up.

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It lets you to add competitors & compare your website’s results with a competitor.

Another nice feature is the ability to add alerts. You can get alerts when:

• keywords you mentioned become the top 1, top5, etc. in the search engines
• your website beats a competitor for the given keywords

Exactfactor is very easy to use with a clean interface & considering search engines are the most important "factors" of traffic, the service is definitely helpful.

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Google now helps this with the Search-Based Keyword Tool.

The example simply demonstrates, if webresourcesdepot.com was to be advertised with Google Adwords & web design was a keyword to be used:

• the tool checks the website to analyze the content
• suggests other related keywords

Definitely a time saver for Google Adwords users.

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When compared to W3C validation services, this solution scans not only 1 page but follows links, goes deeper & almost scans all webpages in a website.

The service uses W3C validation service at the backend & enables you to scan multiple websites.

Report generation can take some time considering it scans all webpages but the service can simply notify you when the validation is completed.

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• Free W3C Validation Icons (With PSD File)
• Free CSS Menus: Styled Menus

Here are some major web-based (excluding softwares and browser extensions) pagerank check & seo tools websites which have resources like backlink analyzers, search engine position finders, and more.

Info: This list is not the "all SEO tools" list, but they are the ones which provide you many tools at the same place with an easy-to-use interface.

If you find these tools handy, bookmark the post at del.icio.us.

iWEBTOOL

They have almost every seo tool you may need including keywork density checker and link popularity.

Khrido

Besides the pagerank check and other webmaster tools, they have some advanced tools like mx / ns lookup, HTML Encryptor & more.

Although Khrido is not the most popular one, it is very user-friendly.

LinkVendor

They have a social bookmark link checker,  visual pagerank checker tool and a free seo report tool which are nice besides the standard seo tools.

SEOmoz

SEOmoz provides advanced website analysis tools like finding how well your website is targeted for specific keywords or countries. Their pagerank checker & similar tools can be found here.

SEO Chat

They are providing some tools for analyzing AdSense returns or comparing Google & Yahoo search results as a chart.

SEO Book SEO Tools

Besides the standard SEO tools, they have an unique keyword analysis tool & a Firefox pagerank checker extension that can be handy.

Google Trends

A great Google tool that gives you an idea about the popularity of keywords, and websites.

If you know of a great one please share at comments.

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TouchGraph Google Browser is a web based tool which helps you to explore the connections between websites based on URLs or keywords (from Google search results) with an interactive visual interface.

Link analysis can be done really easily with this tool and it is very impressive to see a website’s importance for a keyword that clear.

Besides the Google Browser, TouchGraph also offers similar tools for Amazon and Facebook connection analysis.

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I know that robots.txt is not something new. But, I’ve been preparing a SEO sheet for a while and wanted to share this small & useful portion with you.

What is robots.txt?

Robots.txt is a file that is used to exclude content from the crawling process of search engine spiders / bots. Robots.txt is also called the Robots Exclusion Protocol.

Why to use robots.txt?

In general, we prefer that our webpages are indexed by the search engines. But there may be some content that we don’t want to be crawled & indexed. Like the personal images folder, website administration folder, customer’s test folder of a web developer, no search value folders like cgi-bin, and many more. The main idea is we don’t want them to be indexed.

Is robots.txt file a certain solution?

No. Standards based bots like Google’s, Yahoo’s or other big search engine’s robots listen to your robots.txt file. This is because they are programmed to. If configured so, any search engine bot can ignore the robots.txt file. Result: there is no guarantee.

How to use robot.txt file?

Robots.txt file has some simple directives which manages the bots. These are:

• User-agent: this parameter defines, for which bots the next parameters will be valid. * is a wildcard which means all bots or Googlebot for Google.
• Disallow: defines which folders or files will be excluded. None means nothing will be excluded, / means everything will be excluded or /folder name/ or /filename can be used to specify the values to excluded. Folder name between slashes like /folder name/ means that only folder name/default.html will be excluded. Using 1 slash like /folder name means all content inside the folder name folder will be excluded.

There are also some other parameters which are only supported by all browsers. These are:

• Allow: this parameter works just the opposite of Disallow. You can mention which content will be allowed to be crawled here. * is a wildcard.
• Request-rate: defines pages/seconds to be crawled ratio. 1/20 would be 1 page in every 20 second.
• Crawl-delay: defines howmany seconds to wait after each succesful crawling.
• Visit-time: you can define between which hours you want your pages to be crawled. Example usage is: 0100-0330 which means that pages will be indexed between 01:00 AM – 03:30 AM GMT.
• Sitemap: this is the parameter where you can show where your sitemap file is. You must use the complete URL addres for the file.

Robots.txt example:

User-agent: * #allows all search engine spiders.
Disallow: /secretcontent/ #disallow them to crawl secretcontent folder.

Resources:
http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=40360
http://www.robotstxt.org/
http://www.searchtools.com/robots/robots-txt.html
http://en.wikipedia.org/wiki/Robots.txt

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Web CEO, one of the most popular softwares in this area, lets you manage the SEO-side of unlimited number of websites with a very informative interface.

Web CEO comes with a lots of featured free edition & much more featured paid editions.

I’ve been using Web CEO for a long time and one of the best features of it is the advices after analyzing pages. Rather than just telling the problems, Web CEO informs you about how to solve them in a detailed way.

Some Web CEO features:

• Submit websites to search engines
• Analyze a website’s position in search engines for any keyword
• Keyword Mining from competitor’s pages
• Advice for General Search Engine Compliance
• Analyzing Link Popularity (Number of Links to Your Website)
• Analyzing Backward Links vs. Competition
• Reporting

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• Real Time And Deeper Statistics With Logdy
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• How To Use Robots.Txt File?
• Easy Keyword Position Analysis: Exactfactor
• Smarter Breadcrumbs: jBreadCrumb