I'm happy user of Uwatec "Aladin Air Z O2", original DataTrak software and Palm III with great software utility paladin with much more features than original memomouse. Unfortunately new notebooks come without serial ports. I had to solve problem how to transfer data from paladin do PC.
Ofcourse you can get cheap USB<->Serial converter but who wants to carry one more pregnant cable? Older versions of Windows could emulate serial port using IrDA, with 2k/XP it's possible thanks to great IrComm2k utility by Jan Kiszka. Here comes my short "HowTo":
That's it. Miroslav