Alright I'll chime in:
MissAlaska2000 is likely to be the only one I have a realistic chance of meeting these days, as I drive nearby her place to and fro between Denver and Loveland. Maybe one day

Outside of that, I'd be happy to meet up with just about any Prospers peep, BamaLucky would sure be fun after a beer or 2. I'd imagine MtnChick would be an interesting meet as well.
Keryl and Zadrock are 2 other favorites, but I'm never in their neck of the woods.
I'll skip the Prosper.com staffers/supporters in the Bay Area, I'd be too tempted to strangle them and ask "Where's my money dammit!"
ETA: Actually it looks like Shenandoah is in my area too, but insufficient data on him to determine meet-worthiness...