ie-css3.js is a project by Keith Clark which enables Internet Explorer to identify CSS3 pseudo selectors & render any such styles.

Including 2 JS files (DOMAssistant is required too) into your web pages & inserting CSS files with the <link> tag (inline styles are not supported) will make the rules work.

How does it work?

ie-css3.js downloads each style sheet on the page and parses it for CSS3 pseduo selectors.

If a selector is found, it's replaced by CSS class of a similar name. For example: div:nth-child(2) will become div._iecss-nth-child-2. Next, DOMAssistant is used to find the DOM nodes matching the original CSS3 selector and the same CSS class is applied them.

Supported selectors are:

• :nth-child
• :nth-last-child
• :nth-of-type
• :nth-last-of-type
• :first-child
• :last-child
• only-child
• :first-of-type
• :last-of-type
• only-of-type
• :empty

Alternatively, the popular IE7.js offers a similar functionality as well.

P.S. It doesn't support :not() pseudo selector.

LightShot is a simple & free tool which makes taking screenshots very easy.

With the click of a keyboard shortcut, a cropping interface appears where it is possible to:

• set the area of the screenshot
• make it fullscreen
• copy to clipboard
• upload to the net & get a link
  
• edit it on a web-based service

Most of the similar tools instantly take a screenshot of the area you selected before clicking any approve button. LightShot makes it kindly, waits for you to arrange the area, shows you the size of it & a click is required which is better to prevent wrong screenshots.

The tool can work in every computer as it comes as a Windows desktop application, a Firefox add-on & an Internet Explorer add-on.

dynaTrace AJAX Edition is a free tool for diagnosing & preventing Ajax performance issues.

The tool runs on IE & measures the performance of your AJAX application as real users are feeling it.

It traces & analyzes AJAX calls through their entire round trip (DOM event, JavaScript, HTTP request, avaScript callback) and displays network traffic, CPU load, execution times & more.

dynaTrace AJAX also records every session for future offline analysis.

MySpace is sharing an open source project named MySpace’s Performance Tracker which is an Internet Explorer plugin for capturing and measuring possible bottlenecks on webpages.

The plugin is a great helper to developers for:

• measure the CPU hit and memory footprint of your pages
• reviewing screenshots of the page while it renders
• reviewing rendered HTML on each point of the page’s lifecycle
• viewing estimates of the time it takes to render each section of the page in different connection speeds
• validating the content of pages against a set of proven “best practice” rules of web development. 

P.S. The tool is currently in pre-alpha state.

For every web designer & developer, refreshing the browsers to see the updates we make is a very common action.

XRefresh is a solution, specifically built for easing this process, which automatically refreshes browsers once an update to a file in our project folder is done.

It comes with 2 parts: a browser plugin (both for Firefox & IE) and an application (for Windows & Mac) which watches the changes made in the folders we mentioned.

Although it is handy for systems with one monitor, the best environment will probably be two monitors where the IDE & the browsers runs on each.

P.S. For Firefox, it requires Firebug to be installed.

DD_roundies is another rounded corners solution that is very easy to implement & cross-browser compliant.

This rounded corners script doesn’t use any images, works in IE6 without AlphaImageLoader & lightweight (3.62kb compressed).

Radius of the corners are not fixed & can be defined.

As the major problem for rounded corners lies beneath IE, this rounded corners script uses VML (inspired from Jonathan Snook’s solution). A possible future problem is IE8 -currently- does not support VML.