As a part of my noodling around on the Interweb Tubes this morning, I signed The Scratching Post up for Google Webmaster Tools. It shows you all kinds of interesting statistics about your site, particularly about how Google search sees you. The result is full of teh awesome. It gives you a table of Google search terms and where posts from your blog rank in the search results. For example, we're #1 when it comes to the term "lolhamster". We're also #1 on "homemade electromagnet". That explains many of the hits I've been getting from Google.
I haven't finished fiddling around with the thing yet, but it's free and it gives you great feedback on your site. If you try it, I'd love to hear what you find out about your own site.