I think that's the key, and I have done LOADS of research into TV since I was determined never to have Rachel near it but quickly discovered the benefits. I have never let her watch TV on her own; I am always with her and we chat about what we are watching. we watch kids TV progs and she will then tell everyone about what she has watched; numberjacks are fun (she knew how to count to 10 by 18 months!!), noddy did this, fifi did that, tigger bounces, pooh bear loves honey etc etc. we also watch animal wildlife films, I find small bits which we watch and then we do pictures of the animals or pretend we are that animal.
I know the research is very divided but I honestly believe that Rachels communication skills have been enhanced by TV and the way we watch it, that she has learned how colours can be mixed to make other colours, and the importance of friends; it has a place in our life but it's not a baby sitter.