i’m a “registered developer” you can be one too… you just have to sign up for it, it’s free.
everything’s in objective-c, and it’s all event driven. for example: the software keeps track of whether or not a finger is on the screen, how many fingers are on the screen, where they are, and which direction they are possibly moving in.
i don’t really understand much of the stuff yet, to tell you the truth. supposedly, i should be able to “remotely debug” my ipod (i want to use my fingers and use real multitouch, not the simulator they have), but the sdk is not letting me do so. i’m looking into it, so if you have more questions, shoot them by me, and i’ll try to get some answers.