I'm new to the whole "android" experience; coming over from Sprint using a Palm Pre. Question: I have XM on my vehicle and I have unlimited internet usage on my Droid. If I download the XM radio app to my droid, is there a fee for usage for that app? I noticed it was not in the market. Also, I've never purchased an app before in the market. Does that get billed to your phone account or can you have it directed to a credit card? Thanks.