(Sources: http://www.playbill.com/news/article/122497.html and http://www.broadway.com/Broadway-s-Spamalot-to-Close-One-Week-Earlier/broadway_news/5016130)
The second of the Broadway O.R. collection is here, with an article on Monty Python's Spamalot. Spamalot is a show spoofing the medieval times, for those who haven't seen Monty Python and the Holy Grail. However, the jokes are more out there than in the movie (or at least in what I've seen of it). In addition, the humor keeps getting updated. For example, at the show I was at, they did a joke: "When's a plumber not a plumber? When his name is Joe" (It's a political joke). The bad news is that it's closing on January 11th, 2009. When it does close, it will have performed 1,582 performances along with 35 previews.