Hi I haven't seen this crash personally but a crash in pmap.c is a virtual memory issue - it could be a bug or it's possible a borked drive (try Diskwarrior) may be having issues remapping the virtual memory on the disk.
Not quite clear as to why the multi user set-up. Generally should only be used if 2 users are constantly interrupting each other on the same computer. At that point a second computer makes a lot more sense.
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Bill C-51 is an act of Terrorism! It cannot be fixed and should be immediately repealed!
I am one of the few that have had multiple kernel panics under Snow leopard. But my situation is completely different from yours (MBP with screen freezes). I've been to the Genius Bar twice in two days. They tested the hardware and found nothing wrong. The Genius I saw yesterday admitted that he has seen the MBPs at the Genius bar act up under SL.
Hopefully, Chealion's suggestion will work for you. Otherwise, I guess we'll have to wait for 10.6.1
__________________ Current: Macbook Pro C2D 2.2 GHz, 2GB RAM, 120GB HD, 8x Superdrive
6GB iPod Mini
NEW: 32GB iPhone 4 Future: New MBP?