Woo! Hoo! I use MobileMe only for FindMyiPad/iPod Touch but using it to store data would be great.

I digress.

I found another app that is great mostly because it is free. It is called Pinger. It allows for free text and free phone calls over the Internet to any phone number in the country. I called my cousin in Southern California and family members in the Midwest without using a second of my cellphone time. Basically it turns an iPod Touch into a cell phone

There are similar apps like this one. I believe Line2 and Skype can do the same on iPod Touch (4th generation).

On Pinger's website, it says it is for iPhone, iPod Touch and iPad. Please visit iTunes for compatibility.