Looking for a Boolean Algebra site

For quite some time now I have been looking for a site that would help me practic boolean algebra. I've checked the google, altavista, and a few others. I just haven't been able to find a quality site yet. I would like a site that would let me practice some basic, all the way to advance boolean algebra problems and give me some answers along so I know I'm doingt the problems right, along with some basic tuturals like this site has for programming. I don't want people to think I'm lazy and didnt look I did, I just couldn't find a site that had what I was looking for.

~Thank you ,

Flack