I've used DV Matte for years, but it looks like it's only available for Final Cut and Motion now a days. I find those programs helpful, but too basic compared to After Effects. I have to do my compositing in after effects, what is the best green screen plug in that is up to par with DV Matte?!

Keylight 1.2 is excellent plugin. I use it all the time and can come up with some really good keys, even if the green screen isnt perfect.