First up:
Aenomaly Switchgrade:
Note: stated to be compatible with TranzX and PNW Loam so conceivably useable with 27.2 frames and posts.
Aenomaly Switchgrade:
SwitchGrade - Gold Rush
The SwitchGrade is a game-changing new bike component that lets cyclists change their bike's saddle angle and effective seat angle on the fly, without tools! Nose down to climb with greater efficiency, power, and front and rear wheel traction. Then nose up to descend safely with more saddle...
www.aenomalyconstructs.com
Note: stated to be compatible with TranzX and PNW Loam so conceivably useable with 27.2 frames and posts.