I think the DULL XPS1710 is probably the ugliest laptop in the world. That ThinkPad comes close though!
I'll add my thoughts to that, except I'd put it the other way around: ThinkPads are the ugliest, then the Dell. What makes the IBM uglier are all those little stickers on the front: Bleh!
I once heard ThinkPads likened to 'stealth fighters' in that they look cool, mean, and ready for business (???!!!). I don't think so. Macs are utilitarian as well, but are the coolest looking things on the market by a long chalk.