Very impressive!
I woulda had to do some digging to get that one!
On a somewhat related note, I noticed just the other day that the original series episodes posted by CBS on YouTube can now be saved by RealPlayer (a few months ago it wouldn't work). Well, some episodes can be, anyway...about a third will play as audio only. Could be a codec issue, I dunno.
As for the legality of saving such, I seem to recall hearing quite a while ago that the original series is public domain. Could be wrong about that. Don't go quoting me in front of a judge or anyting.