“Trepia? is a revolutionary networking application that lets you instantly meet other Wi-Fi users in your vicinity.
Using patent-pending technology, Trepia? discovers other Wi-Fi users in your area by analyzing base-station access patterns.
Other users will simply appear on your contact list, allowing you to communicate with them. Seek out new people and make connections easily: Trepia? makes you part of an instant community where ever you go.” [via DotBlog]
Could be interesting for gaming, and it should do well on campuses (as noted by Richard).
the world is changing faster than most of us seem to keep up, esp. technology wise.