The Sprint 3G/4G Overdrive allows you to use Sprint's 3G/4G network with any WiFi capable device. including the iPhone, iPod Touch and iPad.
http://www.tuaw.com/2010/03/20/sprint-features-iphone-in-4g-ad
Verizon 3G MiFi does the same thing
http://www.tipb.com/2010/03/10/verizon-sell-data-ipad-mifi/
This means, if you prefer Sprint's 3g/4G or Verizon's 3G service, you don't have to buy the iPad 3G version, just get the Wifi version.
FYI for people who are not aware of this.
http://www.tuaw.com/2010/03/20/sprint-features-iphone-in-4g-ad
Verizon 3G MiFi does the same thing
http://www.tipb.com/2010/03/10/verizon-sell-data-ipad-mifi/
This means, if you prefer Sprint's 3g/4G or Verizon's 3G service, you don't have to buy the iPad 3G version, just get the Wifi version.
FYI for people who are not aware of this.