I almost forgot - there's a wonderful book called "Creative Campfires," by Douglas R. Bowen. I think it's still available from Thorne Printing Company, Inc., 623 - 12th Avenue Road, Nampa, Idaho 83651.
This book saved me any number of times when I was in the creativity doldrums. It has skits, jokes, stories, stunts, and SONGS. Good stuff.
Oh, and then there's a little lifesaver book published by the Boy Scouts called "Group Meeting Sparklers," which I think is the absolute best book the Scouts ever published (the Cub Scout Activity Book runs a close second). I hope it's still in print.
-Joe Offer-