Not sure if this has been posted yet, as I've been out of the photography game for a few weeks, but Really Right Stuff released an L bracket for the Panasonic GH1:
Really Right Stuff - BGH1-L: L-Plate for Panasonic Lumix GH1
No idea if it works on the G1 as well, but I might order one and try it...I miss my L brackets
Really Right Stuff - BGH1-L: L-Plate for Panasonic Lumix GH1
No idea if it works on the G1 as well, but I might order one and try it...I miss my L brackets