You need Windows Media Player or Quicktime 7 to play the videos on your computer. Windows Media Player can be downloaded by clicking here; Quicktime 7 can be downloaded by clicking here.
To view a video on-the-fly, click on the link for the video you'd like to watch. It will either open directly in your media player or prompt you to save/open the file, depending on your browser's settings. The video will play while it is downloading, but there may be delays as it buffers, depending on your internet connection speed. If your connection is slower, you should try the "small" video size.
It's best to save a video to your computer's hard-drive and watch it once downloaded. If you're using Firefox, right-click the video link and choose "Save link as"; Internet Explorer, right-click and choose "Save file as"; Safari users, control-click and choose "Download file as." Once downloaded, you can open the video on your computer without buffer delays.
iPhone users can click on the "iPod/iPhone" link for instant viewing. The "small" format is recommended if you're using 3G or a Wi-Fi network (the videos will play on the Edge network, but might start and stop while playing back as the video buffers). The large iPod/iPhone format is best for downloading to your computer, importing to iTunes and sync'ing to your iPod or iPhone. For help on importing videos to iTunes click here; for help sync'ing your Apple device click here.