Jeff Clavier has a run down of the new features. I use typepad for my personal blog. I agree with Jeff that integration with Feedburner is the best new feature:

The most important one - by far - was the ability to link your TypePad feeds to your FeedBurner managed feed, which I blogged about upon release. For the first time, bloggers know exactly how many subscribers they have across their numerous feed incarnations - and that is important to their ego .