I have been using skewers alot this summer for both meats and vegetables. I like to marinate the food for a while first and then put it on the grill. I also sometimes just dump a bunch of largely chopped vegetables on the grill and cook until tender and they come out really good. Check out this summer cooking article from the NY Times as well for some cool ideas:

http://www.nytimes.com/2007/07/18/dining/18mini.html?em&ex=1184990400&en=3855522410e3df8f&ei=5087 (may need to do free registration)