I let Katelyn watch TV however, we watch it together. She just loves elmo and she really likes the sesame street moving together DVD. We watch it with her and it's really interactive so we jump and crawl and sing a long with it. On the weekends my husband lets her watch as much sesame street as she wants they both sit there together on watch TV it does bother me, but this is his time with her and he can do what he wants. They both usually get tired of sitting there after 30 minutes and he'll get up and do something else. But if I tell him that they are watching too much TV they'll end up watching more TV than if I said nothing. I think sometimes dads feel that us moms are always telling them what to do and they will do the opposite as a general rule to show their independence.
The thing to consider is that watching TV will not make your baby smarter, so if put them in front of the TV all day long it doesn't really do much for them, but if you are otherwise taking them out, letting them experience a lot of different environments and activities such as reading programs, arts/crafts and other activities a little TV is OK. Will TV make your baby smarter? according to the link attached no :-) http://i.gizmodo.com/5164466/news-flash-tv-wont-make-your-baby-smarter-idiots
Have I used the TV so that I can get something done quickly - yes! I am not superwoman - do I feel guilty about it - NO! I do some many other things with her during the day that 20 mins of TV does not concern me.
Like Marina said, it's good to limit the amount of time babies watch TV to 30 mins a day.