I've had my Ipad for a few weeks now. I just got the Sprint Evo. I'm hearing there is a way to link the two so that the Evo acts as a hotspot for the Ipad.
There are several videos on YouTube that will show you how to do this. Use the iPad's YouTube app and search for 'How to set-up HTC Evo 4G Sprint Hot Spot'. The guy takes you through the whole process.