My son will be three in a couple of months and we are going through the same thing. The best thing I can do for him is to make sure he is good and tired before bed and like the others have said, we do have a bedtime routine that consists of reading a couple of books. I will put him in the bed as I read them. Then he has a little turtle that lights up and puts stars on the ceiling and play lullaby music. Sometimes I have to pat his back and lay with him for a couple of minutes. But I tell him that I will only lay there for one song and then it is time to go to sleep.
I used to threaten to put him in his crib when he wasn't cooperating. But then he did so well and we took the crib out, now I don't have that. I've learned with kids this age, you must be consistent with your actions. Don't give in when they cry or whine as unnerving as it can be. My husband is great at this (giving in) and drives me nuts because then my son will cry for daddy because he knows he will get what he wants with him.
I agree with the other posts about the tv. I don't think kids this young need a tv in their room. But that is just my opinion.
good luck!
D. W.