
The two entities that any webmaster tracks are Google PR and Alexa Rank. In order to improve page ranks lot of optimization is done in terms of number of backlinks, listening to daily analysis, upstream sites, downstream sites etc.
Google’s Analytics provides a cool interface for extensive tracking of web pages. Alexa also provides statistics like page reach, related sites, keywords, demographics etc. And some days ago, Alexa included “Search Analytics” which gives information about keywords from search traffic and percentage contribution of each. It is updated monthly and would be a cool tool for webmasters and bloggers to improve the content based on results.

There are three pieces of data Alexa presents: Search Traffic, Top Keywords from Search Traffic and Search Terms with a High Web-Wide Ranking Driving Traffic.
Search Traffic is an estimate of the percentage of visits to the site that come from search engines. The goal of most Search Engine Optimization (SEO) initiatives is to increase the percentage of quality traffic to a site coming from search engines, and Search Traffic indicates how well this is working (see the grapg).

The second piece of data, which Alexa presents is the Top Keywords from Search Traffic. These are the keywords and keyword phrases driving traffic the most traffic to the site.
In the example, the top 10 keyword phrases account for less than 3.5% of the total search engine traffic, meaning that this site is optimized for a wide range of phrases. This is good, because the more phases search engines consider you relevant to, the more potential traffic you can drive to your site.

Lastly are the Search Terms with a High Web-Wide Ranking Driving Traffic. These are the important terms, because they’re there keyword terms and phrases that are driving significant amounts of traffic to the site you are analyzing. The relative importance of the phrases to the site is indicated by the green bar.
In the example to the right, which has been truncated for space, we again see a wide variety of terms. These are often different from the Top Keywords, because again this list takes into account how popular the term itself is. [via Alexa's Blog; the image of Alexa's Logo via PsdGraphics]
If you want to increase your Alexa Rank, here’re some posts:
- Improve Google PR, Link Popularity And Alexa Rank In No Time
- How To Increase Alexa Ranking And Hit 100000 Borderline
- How To Increase Alexa Ranking
- How To Turn Alexa Traffic Rank Into Unique Visitors
- New Changes in Alexa Dashboard

I have been researching this for a very long time now and I have not been able to find such top quality information untill I came to your blog today.
Mark McCulloch