Okay, post your fantasy hacks/accessories for the new Macmini.
How about a 6.5" LCD that mounts to the top like those PSOne/Gamecube screens? And a 6.5" wide mini-USB keyboard that folds down from the front? In fact, combine the two with a wrap-around padded shell to port your Macmini about in. Yes, Griffin Technology, I am looking at you...
How about an iPod conversion- add a matching face to the top, with a basic LCD and keypad/thumbwheel for controlling iTunes? Throw in a decent USB or Firewire audio interface with ins and outs while you're there.
Two words: Battery pack.
One word: Cluster