Two firms to check out:
Zipiko
Let your friends know what you would like or are planning to do. (They are actually right now in San Fransisco, read the article here or follow the stream here.)
TripIt
TripIt is a personal travel assistant that automatically organizes all your travel plans.
Jaiku
(For instance) see where your friends are at the moment (uses probably some sort of GSP technology??)
1 response so far ↓
L. // November 5, 2008 at 5:01 pm
Don’t know if this is anymore even remotely close to what you’re planning on, but http://duffelup.com/ . I especially like the drag-and-drop approach and the (supposed) openess.