Apple Peel 520 is an adapter case that just might hack your iPod touch into something closer to an iPhone, courtesy of a VoIP client, SIM card, and a dream:

Powered by an Infineon baseband chip, this adapter not only offers voice calling and text messaging (presumably requiring a jailbroken iPod touch for the apps; GPRS not possible yet), but it also doubles up as an 800mAh battery and provides 4.5 hours of call time or 120 hours of standby juice.

Whether this ever hits the market in Asia -- let alone North America -- is anyone's guess but if it did show up, would you want?