There is no denying, that for all its faults, the Canon 5DMII, now with its firmware update to enable manual control of shutter, aperture and ISO during video, has become a popular dSLR video camera.
It allows high quality video with low image noise at high ISO, and shallow depth of field which is just not possible on consumer camcorders.
Unfortunately, though, its not really designed as a video camera which makes taking quality videos a touch more difficult – unlike the Micro Four Thirds options such as the Panasonic GH-1 and Olympus E-P1, there is no image stabilisation and no auto focus during video, furthermore there is no electronic viewfinder as on the GH-1, so you are forced to use the rear LCD screen which makes manual focus more difficult and perhaps worse, keeping the camera steady hand held, much more difficult.
Fortunately, there are some after market options which videographer Philip Bloom has just created a blog on and which I felt is worth mentioning here:
The Hoodloupe 3.0 and Zacuto Z-finder V2 – a couple of options to help you view the LCD screen in daylight and at the same time allow it to be held to the eye to help steady the camera.
See his blog here.