Anyone out there using their iPod touch as a PDA? What are advantages and drawbacks as you see it? How easy is it to add appointments and contacts on the fly? Can you sync via WiFi since there is no Bluetooth? My wife is an artist and it seems tempting as a replacement for her Palm ex. Having the advantage of carrying viewable photos of her work to show to clients while handling other PDA jobs. Or is it to soon to make this leap. Any rumors on when Apple might add Bluetooth capability (especially for external keyboards)?