There is the tutorial that how to transfer music/movie/photo from iPod to computer, iPod to iTunes, iPod to iPod, iPod to iPhone, iPod to iTouch, iPhone to iTouch, etc.
http://www.dvd-video-converters.com/guide-ipod-to-computer-or-ipod-to-itunes-with-ipod-transfer.html
There are some great iTunes/iPhone/iPod Transfer, you can choose the best one to meet all your needs.
http://www.dvdtoitunes.net/itunes-ipod-transfer-copy.html
Some useful information you can get on the official site:
http://www.apple.com