Right now I'm running VMware Fusion on my Rev B SSD with 1024MB of RAM assigned to the guest OS.
I have the following apps running concurrently, using a 24" monitor in 1920x1200, under XP Pro SP3:
Outlook
Word
Cisco IP Phone w/USB headset
Cisco VPN Client
MS Office Communicator
IE7
Plus I have Firefox and Adium running in OSX. The machine isn't running hot, and while I've seen better VMware performance, it's COMPLETELY workable, even with all this stuff running.
And, since the SSD is relatively speedy, suspend/restore times are pretty good.
John