While the GH2 is the least expensive way to create impressive video, it has a large learning curve, so it will take some time to become comfortable shooting with it...
[Ruby Gold] "I've heard the GH2 can be a bit difficult to work with re: focusing and that it has no zoom"
Normally all large-sensor video cameras ( this includes every DSLR ) do not come with any lens, so you have to decide on which lens you want to shoot with, and purchase the appropriate adapter if the lens is not a Micro 4/3 mount lens. ( pretty much any lens ever made can be adapted to fit the GH2 or AF100 cameras )
Most people use external HDMI LCD monitors to ensure good composition and focus, though there is a built-in focus assist feature that makes it easier to check focus with the built-in camera LCD.
Here are few links to videos made with the hacked GH2 camera...
GH2 : Musgo Trailer
GH2 : Living the Dream Trailer
GH2 at 10,000 ISO
Here are a couple of links to get you started with hacking the GH2 camera...
An EZ Guide to Hacking the Panasonic GH2
GH2 Flow Motion v2.01 Hack
*** NOTE: You must join the Personal View website in order to download any of the files from that website. It's also a good idea to make a small donation, as the inventor of the GH2 hack owns that website and donations help to fund his work
***
...Also, you need to purchase high performance SDXC memory cards in order to shoot with these high bit-rate GH2 hacks. Currently the best card is this one:
SanDisk 64GB SDXC Memory Card Extreme Pro Class 10 UHS-I : $160
And you will want to buy a USB 3.0 card reader in order to off-load your footage quickly, even if you are using a USB 2.0 computer port.
Iogear SuperSpeed USB 3.0 SD/microSD Card Reader/Writer : $15
...As for audio, you can use a BeachTek passive XLR adapter to record audio directly with the GH2 ( it's very good audio for a DSLR ), or you can use an external digital recorder like the excellent Tascam DR-100 MK2 model.
Beachtek DXA-2T Universal Compact Camcorder Audio Adapter : $179
Tascam DR-100mkII - Portable 2-Channel Linear PCM Recorder : $275
...Later this month, Zacuto will publish their big large-sensor camera shoot-out that put the little GH2 camera against cameras costing up to $65,000. From people who watched this shootout at the theater showings, most audiences put the GH2 footage ahead of the footage shot with $13,000+ cameras from Canon and Sony.
Zacuto Revenge of the Great Camera Shootout