Like right now?
This isn't the MLB trade window, this is the NFL. It's very hard to go out mid season and get a good player without giving up first round draft picks. Teams are built in the off season, so the WR ship has sailed for 2012.
Rice has played better, and hopefully Baldwin starts to get back into the rhythm of the offense. Combine this with Tate playing pretty well and our WR corp is coming around. The one glaring weakness is Edwards, he hasn't played up to where we need the other WR opposite Rice to play. He HAS to make more plays.