I like Diaw, he chips in across the board (rebounds, steals, 3P's, blocks, assists) and seems to have a decent basketball IQ. His scoring is kind of erratic, one game he can dump 25+ and the next go for 4. Overall his production is down and inconsistent - one reason why, as SacKings7 just mentioned, Silas just moved him to the bench. Supposedly he is not a very passionate guy either.
The question is what do we have that Charlotte would want? Charlotte needs help at the C and PF and Cousins is off the table. I suppose we could offer JT or Hickson. Diaw makes $9 million this year, though. We could go after Diaw in free agency, his contract is up this year.
Edit: Oops, meant C/PF (not 1 and 2) as Charlotte needs