I've been taking videos for a year or so and will usually keep fraps loaded when i'm playing FFXI. When something interesting happens, i'll usually capture it on video and upload it.
I started with Youtube, but now i've switched to Stage6 since they allow you to upload very high quality videos. Youtube limits you to 320x240.
I don't have anything really impressive like soloing Ungur or Tyrannic Tunnok, but maybe someday.
Here are some links to the videos:
Youtube Videos (29) High Resolution Stage6 Videos (broadband only probably, unless you download)