I've had my netbook regularly stationed next to my tv-watching chair for 2 years now, for this very purpose. Convenient. Of course, my computer is in the same room, but it does keep me from having to get up and walk across the room. Now I can choose between my netbook and new Touchpad.I remember the annoyance of having to pause the TiVo and run into the other room to look somebody up. But I guess now those were the good old days!
As for your original point, I haven't noticed a change. I don't think IMDB has ever been the best for episode credits. I find that a bit frustrating, as I like to know who the guest stars are. I think the extended 'info' on the Tivo guide data is often better than IMDB.