I was very surprised to learn that Blosxom consists of a single perl script. Yep that's right, a single perl script. Blosxom uses plain text files for storing posts and configuration information. Command line junkies will be at home with this simple, but powerful system.
If you are a Movable Type fan like me, than you should feel right at home with WordPress and their stunning GUI. WordPress requires PHP and MySql. Their site sports plenty of documentation to get up and running easily.
I would also recommend visiting Blog Software Breakdown.