I've been using a free CMS that I really like! The only drawback is there's no real manual so you have to search it's forum to find out stuff. But I predict it will be really big very quickly because it's got a lot of the features of very expensive CMSes and it lets non coding types create articles that go up instantly. It's just too cool to ignore.
Get it at
http://www.phpwcms.de/
P.S. To give you a heads up the only other thing that I'm having a problem with is php's rewrite function which converts my pages to .html . Someone wrote a hack to get it to work with the cms but I guess my host has some kind of configuration that kills it. I'll get it eventually, or pay someone to do it for me, and then I'll have an awesome CMS for free!