So, if I buy an Ipad App......can I also use it on my Ipod Touch, or do I need to buy the Touch version of the same App if I want it? I see all of my Touch Apps showed up on my Pad, some of which I will delete off of it bacause of the size. I guess my question is.....if I buy an HD App.....do I also get the Touch version with it? That would be nice!!!!