I'm going to miss Malik.
I like the Spurs getting a bigger guy in the pivot. Mohammed is tough and he hits the offensive boards (3+/game). I like the trade. It makes the Spurs better inside. As long as chemistry isn't goofed up, I agree with this trade.
This opens the door for Luis Scola. Scola will be an awesome energy player for the Spurs next season and he won't have to play out of position. The Spurs will be even better, not to mention deeper next season.
The only thing I'm not sure about is Nazr's hands. I just don't know if they are much better than Malik's hands. On this team of passers, good hands and alert players are important attributes.