Which teams still have cap room?

The NBA free-agent feeding frenzy is well under way, and a couple of teams have already used most of their cap room.

The Pistons are set to use virtually all of their $18.5 million in cap space to sign Ben Gordon and Charlie Villanueva. And the Grizzlies agreed to trade for Zach Randolph, which will cut severely into their cap space.

Given current projections, only four teams -- the Oklahoma City Thunder, Sacramento Kings, Atlanta Hawks and Portland Trail Blazers -- could still have significant money to spend this summer.