Rated 5 out of 5 stars
Great addon, but the http://www.userstyles.org/ site is *still* down. I have a great addition to share. Here's my pitch: Tired of trying to tab from login to password field on the Google login screen only to get stuck on firstname.lastname@example.org? Fixed that with stylish.
My fave stylish so far is for reddit.com - you can make it look... less crunky ;)