I don't know anyone with a 4 or 5G nano so I am wondering if I can safely assume that any video files playable on my 1G touch should be playable on the newer nanos? I use, more or less, the Universal setting on Handbrake, and have no issues on my touch with them but they don't play on a 3G nano... I think the 4 and 5G nanos added better video decoding though?