While the highest memory card today for the Touch Pro is the 16 GB microSDHC card, a simple hardware hack can get you up to 32 GB of memory on your device. According to WMPowerUser, The hack uses a SD to Micro SD extender card, and allows one to plug in the rather cheap 32 GB full sized SD cards as found here. As can be seen by this screen shot, the OS is perfectly happy with the increased storage.