The big boppers have already been posted, so I want to call attention to one that may have gone under the radar: Mavs/Pelicans:
viewtopic.php?f=24&t=9633
The Mavs were struggling hard before this trade, and by getting a defensive specialist like Cam Reddish to plug some of the swiss cheese they'd been rolling out on D and replacing Jared Allen with not too steep a downgrade in Chris Pallies helped them turn around their season and finish with a winning record and secure a playoff spot.
The Pelicans cashed in and got an impact big where they had previously only had Pallies and Fortre...neither one of them the complete frontcourt player you want to pair with Jordan Johnson and a playoff run.
Neither team may be in the championship conversation as both teams have weaknesses that more loaded opponents can exploit, but it was a nice trade for both sides that appeared to get the job done that both GMs wanted it to do, even if it's not a trade that will have repercussions beyond this season.