I've read loads of discussions here about the "ultimate" case for the Raspberry Pi: Lego, cigar boxes, nice metals... Which is all very nice, but how about a simple solution? Wouldn't it be possible to just use a transparant plastic bag (like the ones used to deep freeze food), put all the cabling through the opening and (almost) seal it with adhesive tape? Keeps dust out, shouldn't give any cooling issues. And you can still admire the board in all it's glory.