[sethbannon]

At my startup we prefer Fischer Random (aka Chess 960) blitz, where the opening positions are randomized (with a few limiting rules). Read about it here: http://en.wikipedia.org/wiki/Chess960

Bullet chess (where each side has only 1 minute on their clocks) is also a great head clearer and adrenalin booster. Video: http://socialcam.com/v/kBzSWTQk?autostart=true