I have own an article site about jQuery, Php, MySql etc etc. It had an Alexa rank in between 350,000 and 400,000 in 2010 December. But I had never got a chance to update with new articles since 2011 January. So my Alexa rank got down to 627,800. When I do keyword search for my domain name using Google Keyword tool, there is not even a single result found. How does this happen? Any idea ?
I haven't seen your website but it seems the targeted keywords are not in textual form, either they are as images or are getting called from database through scripts (javascripts), which a search engine cannot read and similarly the keyword tool is also not able to trace any textual content on the site.