On the heels of the new dashboard rollout this week, Xbox Live's Gold level services are free to all this weekend. In addition to multiplayer gaming, features like Video Kinect are also available to Silver (free) subscribers. The weekend includes free previews and discounts on downloadable films (like The Hangover) as well. Enjoy.
[Correction] I misread the listing; the weekend is free for European users; North America got a free weekend back in November.