With much pain I managed to convince a Vmware WinXP virtual machine to run in VirtualBox. At first it ran very sluggishly(>3 hours to do a build?), but after I turned off IO Apic stuff in Windows, it’s become disturbingly fast. It now takes 40minutes to build a wince fennec vs almost 80minutes it took on VMware server.
VirtualBox’s disk throughput is phenomenal, in fact, this is the first time I’ve seen almost-native speed disk io in virtual machine. A benchmark I tried reported 45mb/s 4K read/writes (these were cached on the linux side).
Unlike Vmware server, VirtualBox’s usb works without troubles, shared folders were easy to setup etc. It’s an awesome app, hope Sun/Oracle keeps it up.