I've been really eager to replace my T-Mobile MDA with an iPhone. However....I just watched the guided tour, and now I'm worried. I have long fingernails. They have never been a problem with my MDA. Actually, they have often been my stylus of choice making things much easier on my MDA. The guided tour made it look like you must use the tip of your finger with its multi-touch interface. Does anyone know if the pad of the finger or more preferrably if the tip of a fingernail would work?