Update to ios 5.1.1
How can I be sure that all of my songs/pod casts will be saved when I update to ios 5 when I have 2 libraries (2 different computers)? Can I combine them first so I don't loose anything?
iPod touch
Transfer iTunes purchases to the computer by:
iTunes Store: Transferring purchases from your iOS device or iPod to a computer
In iTunes 11 use Control+B to show the Menu bar then go to iTunes>File>Devices>Transfer Purchases
For other music you will need a third-party program like one of those discussed here:
Recovering your iTunes library from your iPod or iOS device: Apple Support Communities