We're TV-free and have been since June (tho we just got a big projector and movie screen to watch DVDs and we subscribe to a service similar to netflix, so we watch a lot of movies) and I LOVE IT!!!!! So does my football obsessed husband. (He was worried. But he's been listening to the games on the 'net radio). Not having cable/ TV is wonderful. I am actually grateful to myself and my DH that we made this step! (Watching TV now when we're at someone else's home or in airports or whatever is just weird... it's such a lesson in how we get used to so much
OTOH, it'd be very very hard for me to give up the internet. I would probably benefit from it, but it would be awful at first and I would miss my friends. I don't think I'd ever do it, but you never know. I do know that when the babe comes, I don't want to spend as much time online then as I do now... but I think that'll be a natural effect of parenthood.
Though I did have an OK time when my computer broke and I had to go to the library to check email. It was frustrating in some respects, but it was also a nice vacation of sorts... that's something to think about. Maybe give yourself a week or two weeks where you don't use the computer at home, but go to the library. See how that works out...