if you have your blog in a directory called wordpress and have a post slug with wordpress in the title, you may be getting a 404. It also happens if you have a category called wordpress when your blog is in a directory called wordpress. Any ideas on how to fix this? i'm sure a lot of people will be seeing this problem. It only happens in 2.0.
to see what i mean, go to http://myblogisbetterthanyours.com/wordpress/ and click the post with "wordpress" in the post slug. that's my test blog.