Easy Keyword Position Analysis: Exactfactor

Exactfactor is a free web based service that enables you to analyze the positions of keywords of a website in major search engines.

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.