I love watching videos on my computer. However I hate the fact that a simple avi file may not play because of some codec issue. I found this link from digg.com regarding a codec finder. I gave it a try on a file that I could not play. It worked great. If you ever have issues with some hard to find codec, give this a try.
CodecInstaller – http://www.jockersoft.com/english/codecinstaller.php