I'm running Fusion 3 on a new IMac 21.5" running 10.6.1 with 8G RAM with XP SP3 guest. Just migrated from late 2006 MacBook running Fusion 2.06 using Mac migration assistant, then upgraded to Fusion 3.
Main issue is that when I updated hard drive size from 40G to 100 G and changed memory allocation from 2G to 6G, Windows OS is not recognizing change. Windows reports 3G memory and 40G hard drive.
Other issues:
OS (or VMware) is also unstable and hangs, barely responsive without indicating heavy CPU use and sometimes will not restart, requiring Force Quit. Usually will run for 30-45 minutes before hang. Only application I run is Revit 2010 (which is also unstable, just installed service release 2).
Tried to install new Guest but get "No bootable device" message - saw thread for this and will create ISO image.
