the BGF1-L L-Plate for Panasonic Lumix GF1 from Really Right Stuff is machined from a solid block of aluminum, which creates a fixed L-plate that can be changed while on top of a tripod, from a vertical to a horizontal position, without sacrificing your center of axis.
The Arca-type compatible dovetail plate adds quick release functionality to the camera, and the anti-twist flange with the 1/4"-20 mounting socket keep the camera body from moving. Also, the L-plate maintains complete access to the battery door and the camera's ports. Because of type II black anodizing, the plate itself is resistant to scuffs and scratches. Additionally, the plate has a laser-engraved center mark on the back to align it on a head.