Several mini iPod concept designs have popped up on the web.
Here is a list of links to several.
This is not the new mini iPod
First Look at the new mini iPod
Mini iPod Mockup
Mini iPods (Version 5)
SirGiggle Would Buy This Mini-iPod
Mini iPod
Mini iPod
Simple idea for miniPod
New iPod Remote with SD Flash Card Sticking Out
My mini-iPod