+1 vote for Wordpress. It's very easy to install, took me about 5 minutes initially, its being developed lots, its easy to use, it allows the use of plugins, and its completely free!
Check out the link in my signature to see it in action. What I really like about it, is that its written using XHTML which means it was easy for me to use my CSS to control its look. I have 3 different styles which Wordpress lends itself to most easily.
Possibly most telling is that my friend used Moveable Type for years, and switched over to Wordpress when I recommended it to him. If nothing else, its worth checking out
