Learn how to delete photos from an iPod Touch, iPod, iPhone, or any kind of iTouch. The trick is to hook it up to your Windows PC or Mac and use iTunes to sync with it. You'll then be able to go to the photos tab to remove specific photos from your iPod/iTouch device.
On on iTouch, iPod Touch, or iPhone, you can also delete specific photos by opening the Photos app, tapping the photo you want to delete, and then tapping the trash can icon in the lower-right of the screen. That's probably the easiest way to delete photos from an iPod Touch.