The CLips dont need him.
You're right, his defense is bad. But he is our only inside presence. He is young and is an automatic double double. That is very rare these days. He also hustles and has a good attitude. Maybe he can learn to play average D one day, but in my opinion you cant trade him. You need capable players on your team when 2010 come around. He would be a great piece to have play the post with Bron or Wade or Joe Johnson. If we got a real defensive center, like a Thabeet (prob wont happen), David's defeciencies on D would be masked by that center. Bottom line, i think you're shooting yourself if you trade David Lee.