If you have a Media Center PC (or if you’re thinking about getting one), bookmark mcesoft.nl:
Media Center Plug-ins are little programs that give new possibilities or expand existing functionality to your Windows XP Media Center Edition. Many programmers have made and are still making these Media Center plug-ins to make features available which aren’t there when you have a Media Center “out of the box” This goes from features like a system for categorising your DVD’s and Movies complete with descriptions, actors and director info to features like having your local current Weather situation and forecast available, but it also includes the possibility to listen to or watch online media or the possibility to edit or compress recorded television and make a DVD of it. This site is dedicated to those plug-ins and we will try to give you as much info as possible about them.
I just installed the latest version of MCEWeather. Excellent, and it works with my Media Center Extender as well.