Sends any file (jpg, txt, exe, etc) from your Pocket PC phone to your friends Pocket PC phone (who must also use GSMbeam)

GSMbeam is what it sounds like. Two people can use it to beam stuff over the phone. No GPRS, no special lines needed.
The idea is that you leave it on all the time. Don't worry about wasted cpu time or battery life because most of the time the threads are in wait states doing nothing. When you push off there is no processing by GSMbeam, the hardware "wakes up" the device when a call comes in, and then it dose its thing.
- Any data sent is checked for errors and reassembled before you get a confirmation at the sending end. This means that if you see the sent ok icon it is 100% certain the file arrived intact (although the receiver could still choose to reject the transfer). Conversely, if you received a file you can be sure it is intact and not going to contain corrupted data.