eris : design has some great looking, free, xhtml valid blog templates that work with a ton of blog apps: Diaryland, Diary-x, Blogger/Blog-Spot, Signmyguestbook.com, MovableType, B2, and WordPress.
What's better than great looking, XHTML valid, free templates? How 'bout an online system that configures them automatically for your blog and gives you the ability to skin your site?! Wow!
I really can't get over how incredibly good looking and extensively detailed the templates are. And the best part is that it is so simple to configure. Quit reading this and get thee over to Eris Designs now!