I have an old ipod touch 1st generation. And this Christmas as a gift I got a new ipod touch 2nd generation. I would like to transfer all my files from my old ipod touch to the new one. What are the things to consider?

I also do have an iTunes account, what will happen with this? Does that means I'll have two itunes account now?

I installed some applications and I want to retain them on my new ipod touch, how will I go about with this? I would be glad if you could send me a link where I can follow instructions on how to do it.

How about my notes, my calendars, how can I transfer them to the new ipodtouch?

Thanks for your help in advance