I use a Canon HV20 in the backcountry. Reasons: proper HDV recording to tape unlike most of the new breed hard drive based cameras. Huge quality difference, since to boost recording time, they compress the heck out of the video in those cameras (inlcuding GH1). Proper HDV footage is 25mbps. Even with the better h.264 codec, the hard drive or flash based cameras rarely go over 6mbps, and given these are single-pass encoded files, they suck.
Shooting tape means you can bring hours and hours of media. On the long treks I do, that's a major factor, because you probably won't have a chance to unload a hard drive. Flash media may work, but again, you probably are looking at compromised master video quality, because they want you to feel like you hav ea lot of storage space in a dinky 2GB card. A tape is 15GB each, for 63 mins of proper HDV footage (and even HDV is really a compromise and not really 1920x1080)
Apart fom that - the HV20 does pretty decent 24P once you have the right tools for post production, can be picked up for peanuts, and has a huge following in the indy film maker camp. Tons of accessories and lots of expertise available for it, too. Battery life is exceptional (I brought tow batteries and a solar charger for a 14 day hike last summer - enough for 5 hours of footage, and I only had to charge one battery once)
Still images can be pulled off the tape - they aren't anything like what a true DSLR will give you, but they are good enough for web use.
My HD camera gear for this summer, a 444 mile trip with a few resupplies is as follows
Canon HV20, Raynox wide angle, carry pouch 34.7 oz
Canon DM50 microphone 4 oz
large spare battery 2.5 oz
DIY unit for e2 Lithium cells 5.3 oz
52mm Hoya circ. Polarizer 0.7 oz
Cokin filter holder P type 0.7 oz
gray and tobacco gradient filters 0.7 oz
DIY tent pole tripod 5.6 oz
I ditched the solar charger since it forces you to stay put and leave it in the bright sun for a few hours. It doesn't work on the back of your pack. No time for that, and a custom battery pack made with lithium AA's which I can replace at my food pickups is much lighter overall.
One thing about the video gear, though - I'd never bring it without a "human story" to cover. Video to shoot landscape is lame. You gotta have more to tell than waterfalls and campfires.