Last week VMware announced the availability of Fusion 3.0.1 (build 215242).
While it seems just a minor update, it introduces a couple of key improvements.

First of all, the Windows virtual machines gain now from 20% to 80% better performance on Mac OS X 10.6 (codename Snow Leopard) for 3D and video tasks.
It seems that part of the slowdown experienced with Fusion 3.0 on Mac OS X depends on the VMware Tools which are now improved.

Additionally, Fusion 3.0.1 introduces a brand new 64bit networking stack, which was not available when VMware launched the Fusion 3.0 64bit engine.

Finally, the new product supports Ubuntu Linux 9.10 (codename Karmic Koala) as guest OS and Parallels Desktop 5.0 virtual machines for importing.