Having problems with the videos? Make sure you have the correct files installed!
For MPEG, the standard media player that comes with your computer should work.
For RealMedia (RM), you need RealPlayer.
For DivX, you need the DivX codec (also available for Mac and Linux). For Windows, ffdshow is recommended instead of DivX.
For best results, do not simply click on the links. Either use a download manager, or right-click on them and choose the option to save them to your disk (such as "Save Target as" or "Save Link as").