Hi Craig and welcome to the boards! :)
Just so you know, most domain hosts have the auto-install for b2 aimed at "news", so unless you want your blog with the directory of news it's probably a good idea to install it yourself. (I know this as I'm a host. )
Yes, b2 development has stopped. It stopped sometime in the early summer. A lot of people are still using b2, but some are migrating to WP like I did.
There is a readme.html in the WP package that will explain how to upgrade from b2 to WP. "Upgrading from b2 v0.6.1 to WordPress v0.7"
I have used the following: Blogger (on their server), Grey Matter, Movable Type, b2 and Word Press. I liked MT until it became over 5 minutes to rebuild one template. Then it locked up on me and lost all my posts. The posts that it didn't lose were bloated and took up a lot of room. I found b2 that uses a MySQL database and runs on PHP. It takes up no room really on the server, I pay for my domain bandwidth and space, don't you? Once Mike and Matt started on WP, I knew that it would be a great CMS and waited until private entries were finalized before coming back to blogging.
Oh, and I like the fact that WP is free. I like it so much that I would donate without being asked. No one has to be paid to install it...it's so simple anyone can do it that can read. :)