ProximityMail from Interop software is point-to-point networking software that allows you to exchange messages anonymously with other users without the need for routing through a central server. Users can communicate spontaneously, without the need to know anyone else's phone number, email address or PDA id. It sounds a little bit like IRC backchanneling, only for PocketPC devices — it could be fun if you attend a lot of conferences and events with other geeks, but don't expect to be getting too many random ProximityMail pings whilst in your average movie theater yet (unless it's a screening of, say, Revenge of the Sith, perhaps). The software runs on PocketPC, PocketPC 2002 and 2003, and PocketPC Phone Edition 2002 and 2003, and is free with a suggested donation of $10 if you dig the software as much as those ladies in the photograph clearly do.
[Via PocketPC Thoughts]