This is a starting place to share ideas and questions about building simple and fancier gripping or gripper NXT robot arms.
Please see the "Let's Talk Robot Arms" entry in the LEGO MINDSTORMS NXT Blog (select Blogs from the NASATalk menu and scroll to LEGO) or jump there now.
Also, see the NASATalk blog of the 5th / final day of the WaterBotics training workshop for pictures of easy-to-build gripper arms in action.