Some of the cool new stuff:
- RSS feeds for comments on individual posts or the weblog overall.
- You can link to individual comments.
- And for me :-), a much nicer and more powerful admin interface.
It's all CSS-driven and they recently had a competition to write some stylesheets. You can see all the entries here and there are some fantastic ones. Alex King has also written a tool that lets you switch them on the fly!
Kudos to everyone involved in this project, I think it's fantastic! It's powerful, was easy to set up (although the upgrade process from b2 could've been documented a bit better) and everything seems to work fine. What more could you want? 8)