For a while now I've been struggling to see some various avi codecs using quicktime. Stuff that just works nicely on my windows box just seems to be riddled with headaches on my mac. Well last night I discovered a little app called the VLC player.
How this happened: 1) Quicktime moaned that it couldn't play the movie correctly, so it sent me to the Quicktime site. Fortunately, I knew it was an XVID codec I needed (see, before, I didn't actually know - surely Quicktime should also tell us WHICH codec we need, not just send us to a list of 10 Quicktime plugins saying "pick a codec, any codec... oops, wrong codec").
2) I went to the XVID site, and downloaded the plugin, but at the same time I saw a link to another video player, suddently the mist started to clear and the sun came out and a chorus played in the background (it was late).
3) I downloaded this app also, and found my Quicktime plugins didn't solve the problem, so I installed VLC and happily forgot about Quicktime. What's great is that it is also multi platform, and responds to the Apple remote control too (Windows Media doesn't!).
It also supports Windows Media formats, and does a much better job than the Windows Media Player 9 for Mac. I'm impressed, so check it out.