Found Alexaholic today…as described by the site:
Alexaholic blends Alexa website traffic graphs with a lightweight ajax-enhanced interface to satisfy hard-core Alexa traffic chart junkies – aka Alexaholics.
Webmasters, SEO/SEM specialists, and domain owners can compare and measure website statistics for up to five domains at once, switch traffic chart types and ranges without page loads, and generate report pages that are easily bookmarked and shared.
Click on the following link for an example; it compares the page traffic to my site and the sites of some friends. Naturally this can be used for smarter and less ego-centric purposes!