I've always thought the A380 looked hideous, but could never rationalise my reaction. Then somebody mentioned the cockpit position on another thread a few weeks ago and I realised that was it!

I would say Concorde has to be the most beautiful commercial airliner of all, but I also love the 747 and will be very sad if / when they stop producing them. The 787 seems like it'll be a real good-looker as well, though.