Tiny bathrooms call for tiny sinks. But sinks are serious: they get heavy use and can be the difference between happy efficiency and downright discomfort in the bathroom. Some of the best designs that don't make you feel like you're on a plane, train, or automobile:

Sink Positive accessory sink (thanks for the tip, cdb!)
• customized Problem-Solver sinks from Bates and Bates
• the svelte Elfe by Porcher
• Duravit's corner-mount Architec
Alex TINY bathroom sink -regina