This is a quicky, for a guy over at CGTalk named Lew. He was asking about keying defocused things, so I made a little screencapture giving some of the major tips I could think of for keying that kind of thing. It doesn't cover every detail of taking it to a finished key, but I think it's useful enough that maybe other could get something out of it, too. http://www.mackdadd.com/CG/CGTalk/Defoc ... better.mov
I also show why Keylight is way better than Primatte or Ultimatte for this sort of thing.