The GF1 is a pocket/light carry camera. The G1/GH1 is the way to go if you intend to be spending time on a tripod as it\'s simply more flexible due to the flip/twist LCD and larger, higher-resolution fixed EVF.
Interestingly, RRS and Kirk make L brackets for the GF1 but not the G1/GH1. I was leaning towards the G1/GH1 due to the better grip than on the GF1 and that I am a bit old school and like the EVF being there without being this obtrusive add on.
Because the screen is hinged to tilt and swivel around RRS said a plate was not possible. If you want to have the screen in a fixed position you could probably use a generic L plate.