In the Reduced Shakespeare Company's "Tweeting Shakespeare" project, the All's Well That Ends Well "tweet" goes like this: "All Is NOT Well That Ends Well, and this play doesn’t. MORAL: Do it with the lights on." (Source).
The 51st episode of Futurama is called "Roswell that Ends Well" (originally “All's Well in Roswell”). In this episode, the crew of the Planet Express travels back in time to Roswell, New Mexico, the location of the infamous UFO incident of 1947. (Source).
There's a big shout-out to All's Well That Ends Well in the movie 8 Mile, during the freestyle rap smack down between Lotto and B-Rabbit (a.k.a. M&M).