I have written about HitTail a couple of times recently in the following posts:

• http://www.webmetricsguru.com/2006/08/hittail_gets_good_reviews_from.html
• http://www.webmetricsguru.com/2006/08/measuring_blog_popularity_with.html
• http://www.webmetricsguru.com/2006/07/search_term_analytics_gets_mor.html

CNET just wrote an article about HitTail today  -

"But there’s another valuable way to use search engine results: the new HitTail service.

The service attempts to divine what your site’s visitors are "trying to tell you with the language of search." It looks at the search terms that got visitors to your site but that are showing up low on search engine results lists. HitTail posits that if you write more about these terms, you’ll get more traffic from search engines.

This is a very clever idea, and during the free beta period it’s worth trying out if you write a blog or run a commerce Web site that has a blog attached to it. Be warned that there is a lot of cultish prose on the site about the Long Tail effect and the certain riches that will come your way if you use the service. Try to look past the hype and focus on the interesting and valuable information that HitTail offers. "

I think HitTail does work, does tell you what terms you could write about that would drive traffic to your blog - but you need to adopt a way of working with this Web 2.0 application in order to create the content on a regular basis - no just once in a while.   If bloggers are going to make use of the Long Tail, they need to post often or if your site is not a blog, create pages often, that use the terms that HitTail suggests to write about.