The GH2 is an awesome camera, really awesome once you hack it. The only problem is the lack of custom made accessories for its form factor.
A few months ago I was looking to gear up my GH2 with a nice follow focus rig for shooting video, and if anyone else out there has done the same thing, you've probably realized that there aren't quite as many options as there are for the canons.
(or even the nikons for that matter)
But I did come across something really nice -
the SYSTEM ZERO Follow Focus Standard Panasonic GH2 from IDC.