It works on all generations of the nano and nothing else. Considering there have been a number of other iPods out since the first Nano came out, I wouldn't hold my breath. It's a little extra money (although I use my Nano 2G almost exclusively now, I bought it for Nike+), but the Nike armband, Nike+iPod, iPod Nano combination is amazing. I never regret having bought it.
Its not entirely of importance, as I don't plan to get an iPod touch. (I currently have a 1G nano and 60 gb 5G iPod) Just interesting to know. Hopefully someone can chime in once they get one and try it.
Well that is really a shame! The iPhone I can understand, it is kinda big to run with, but the iPod touch is about as thin as a nano! This means if I were to get an iPod Touch, I would still need my nano for nike + running, and my 60gb video to hold all my stuff! What a rip-off! I guess I will be sticking with my current configuration then.