The Digit Online News team took a look at the new iPods which feature a nice color screen. Here's a snip from their review:

The new 20GB model is 1.5mm thicker and 8.5g heavier than the old 20GB model, but the exact same size (1.6mm thick) and weight (167g) as the 30GB iPod photo, meaning that any accessories – cases, dockable speakers, and the like – that fit the 30GB photo should fit the new 20GB iPod perfectly. If you're upgrading from an older 20GB 4th-generation iPod, all but the most form-fitting accessories should work with the new colour screen version.



Link: Digit Online News