To start with, they've added the ability to import functions from Excel. You can also now analyze your blist and see who's viewing them and get statistics. It's also easier to search for blists now which ties into the entire community aspect of blist. Almost behind the scenes it seems like the blist team has built a fairly robust social network around lists. You can share, comment, tag, and enhance lists from other people. It includes the ability to add friends and rate other friend's public blists. I haven't been able to play with the collaborative features of blist (because I don't have any friends) but enhancing that seems like the next logical step and opens up some very, very cool possibilities.
The blist team keeps on doing great things around a very well-designed RIA. They've got a lot of money in the bank, a great team and a wide open market. Still very much a company to keep an eye on. Especially if/when they start rolling out an API.