Before DD was born I was all 'no tv for my children till they're so and so old, and its only documentaries and educational DVD" that's me hysterically laughing at myself for even thinking that!!!
I used to watch tv way too much so since DD I've made an effort to cut back, I record shows I want to watch and turn it on when I have a free half an hour, she watches tv in the afternoon when I need to get something done, she likes to dance to the bubble guppies and jungle junction, she plays while the tv is on and will watch when music comes on so she's no "glued" to it.
DH will watch sport with her, after 6pm and weekend it's always on, not sure how to curb that habit...
I think a little tv is ok, I try to not have it on all day for no reason, avoid shows with commercials or fast forward through, and watch appropriate shows (I avoid trash tv, seems to suck you in somehow) so far we haven't had an issue.