I keep forgetting to mention this great resource I found at NCTM one year. If you know of the Pizzazz worksheets, it's sort of like that, but for calculus (ooh, aah). It's published by Nasco, and called "Calculaughs Joke Worksheets", by June Oliver - who apparently was/is a calculus teacher and made up a variety of joke practice sheets for derivatives, mean value theorem, integrals, etc.
I've already used them when I want to come back to a topic after we've moved on. It's a nice way for the students to refresh their memories. I LOVED the types of questions on the MVThm sheet. I could never find enough satisfactory problems elsewhere for my kids to practice with. It also gave me some ideas on other types of activities I can have for that topic.
Here's a link I found: http://www.enasco.com/action/search?catalog=math&q=calculaughs&x=0&y=0
I'd also love to hear of other such resources for precalculus or for calculus ... even for algebra 2, because it's nice for the kids to refresh their memories on OLD topics.