Dyson's Air Multiplier is the world's first fan without blades, and really blew me away (get it? huhuh).
Air is taken in through the openings in the foot, and is amplified before it is squeezed through a 1.3mm aperture around the ring. Dyson promises a more powerful and more steady airflow as a result.
Make sure you also check out the Air Multiplier's great press kit, giving you 'twenty uses for the old buffeting blade'.
Photography courtesy of Gizmodo.