Alexa Web Search -- For Webmasters

Alexa Web Search -- For Webmasters: "There are a few reasons that Alexa may not have visited your site. Perhaps your site is new or we haven't discovered any links on the web that lead to your site. Or perhaps we haven't had any Alexa users visit your site. It is also possible that your web site administrator has disallowed crawlers from visiting your site - please read the information about robots.txt that we have provided above.
In any event, simply by visiting your site with the Alexa Toolbar open, Alexa will learn of your site and add it to our list of sites to visit, thus ensuring your inclusion in the Alexa service and in the Alexa archive.
If you are the type of person who won't be satisfied until you get to click a button that says 'Crawl My Site,' then we have just the form for you. Simply type your site's web address into the box below, and then click the button. Alexa will include your site in the next crawl of the web, usually within 8 weeks of submission."