Does this exist?

For instance, you have some even like a wedding going on. Lots of people are traveling and the guest list is big enough that there’s a good chance you don’t know or can’t think of everyone you’ve met that’s going.

If the host uploads the guest list somewhere I’d like to be able to see which members I’m friends with on Facebook or have in my Outlook contacts (or whatever). Then once I’ve found my relevant subset, pull in other data like where we all live from Facebook, when we’re traveling and staying from Tripit, etc. Then it could intelligently suggest activities like sharing a cab from the airport.

The high friction point is obviously getting the source of the list, but so much of that is done via Facebook, evite or some other system that has (1) very broad reach (2) naturally unique identifiers (3) a pretty good idea of who I know.

If this exists I guess I’ve missed it. If it doesn’t, then I hope someone makes it.