Particularly:
Unity mode — Integrate your favorite guest applications with your host. Open the application window, enter unity mode, and then minimize the Workstation window. The guest application windows look just like host application windows. You can access the virtual machine's Start menu (for Windows virtual machines) or Applications menu (for Linux virtual machines) by placing the mouse pointer over the host's Start or Applications menu.
Accelerated 3-D graphics on Windows XP guests — Workstation 6.5 virtual machine now support applications that use DirectX 9 accelerated graphics with shaders up through Shader Model 2.0 on Windows XP guests. Hosts can be running Windows 2000, Windows XP, Windows Vista, or Linux.
http://www.vmware.com/products/beta/ws/releasenotes_ws65_beta.html
The Unity feature looks sick. I guess it's been out in Fusion for the Mac for awhile, but this is the first I've heard of it (I don't use Macs). I didn't completely understand what it was just from their description, but once I looked into it, I got pretty excited.
http://www.chipx86.com/blog/?p=237http://www.youtube.com/watch?v=JIApJMzGzDQ
edit: Here's some 6.5 beta videos:
http://www.youtube.com/watch?v=hnI00gTUwI8http://www.youtube.com/watch?v=WQ8CT_rokHA