I use to have an iPod Touch 2G 16gb to go along with my Bold, but I rarely used it so I decided to sell it. Its a great device and I got it to replace the iPhone 3G that I had before my Bold. It just couldn't be used to its full potential without wifi. I had so many useful apps that I bought when I had the iPhone, but I couls only use them when I was in a hotspot which was rare.
For just simple music playback my Bold gets that done without a problem so I'm just using that at the moment. If you are constantly in a wifi hotspot then the Touch is a great device, but if not you're carrying a device not living up to its full potential.
Posted from my CrackBerry at wapforums.crackberry.com