Quick tip from a comment

In a comment, Nicholas pointed something embarrassing out to me; my site didn't validate according to W3C standards :( Naturally it should, and I've managed to clear almost all errors. The last thing missing is in my profile to the right, which is something Blogger generates, and right now I've used too much time with the blogger editor to bother fixing it.

Anyway, Nicholas' point is right on target. If your website doesn't conform to the standards, it's much harder for the search engines to read your website properly, and you might end up with unindexed content if you are really unlucky.

To check whether your website uses valid HTML, you can use W3C's validator engine here: http://validator.w3.org/