Age of Conan, an mmo by Funcom, the people who made Anarchy Online, has been in open beta since April 3rd and is scheduled for release on the 30th October 2007. It is also reliant on Vista's graphics framework. Funcom showed the game off at E3 in 2005 and 2006 and in both cases got awards. The official site is here, IGN has a good batch of screenshots here, for anyone wanting to get in with the beta, the application is here.
I'm beginning to feel bombarded by mmo's now though. Given the time each one needs, can the market support what seems to be a never ending stream of new ones?