Ummm also try search
live chromakeyer hardware
Afaik, there are 3 ways to do chromakeying.
Live,
Realtime and
Rendered. Good hardware for live keying is expensive and also fussy, as in you need a really good setup to get good results. Realtime or Rendered solutions are more flexible as there is a higher degree of corrective features available ..hmm.. there's more stuff to tweak!
The live stuff, I've only seen in broadcst stations. Production houses I think generally use the other 2. There maybe some cheaper ones for live but I would question the quality.
Realtime keying, is also hardware based. You digitize your footage shot on blue or green screen, then you use the key's available in the editor. Because of the hardware, you can preview the key in realtime meaning no rendering before playback. Checkout videoguys.com for a comparative guide to some of the prosumer hardware available.
I've used Pinnacle Studio Pro (something like that) and Matrox X100, with Premiere. I like the Matrox.
Rendering - This happens if you don't have hardware or you need much finer control of the key and masks. Premiere's keys will do a decent job, but in real tough situation AfterEffects saves the day. Especially when I've had to work with poorly lit footage, soft shadows, and nasty blowing in the wind hair with the blue reflected on the subject.
So unless you really need to be live or just have the budget to burn I would suggest lookin at keying in post, with some like a Matrox x100 or equivalent.
Hope that helps a little more.
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