Use Hazel, well worth it. from Hazel you can say move movies to one folder and have it add it to iTunes, move TV Shows to another folder, and have it add it to itunes, change the color label etc.
As far as moving them to other iTunes, well you could by using Hazel as well, to do differnet iTunes, I would think you would have Hazel move the movie(encoded) to the Automatically Add folder in iTunes(whereever that Itunes account has it's folders) So 2 diffeerent iTunes would have 2 different locations for Automatcailly Add. Then the iTunes would add the movies to the current iTunes account for that iTunes. Hopefully that makes sense.
Yeah... thank you that's great. I'm going to give Hazel a try. Ripping/Encoding going well - I've just finished one (Large) shelf of DVDs and I'm about to start the 2nd!
Racetripper, I've not done any Blu-Rays, so I can't help. Sorry.