Well, for this one, none
I missed the show, but a couple of people on the alt.binaries.multimedia newsgroup post new episodes shortly after the broadcast (supposedly they're capped from HDTV and downsampled, couldn't prove it by me.)
Anyhow, once I downloaded the file I used the movie viewer that comes with Nero CD burner software to do frame grabs, then clipped out the scene with VirtualDub (freeware) and re-encoded it with Dr. DivX.
I have the decontamination scene episode on my harddrive somewhere too - if the scene is small enough to fit I'll post it in the future.