Here are some home videos Stephen pointed me to of the recent tsunamis. All WMV format:
[Update Dec-29: Apparently, that site got too much traffic, and it's only hosting the video via BitTorrent seeds now, so you'll have to use BitTorrent to get them at this link.]
patong_beach.wmv - This one shows was shot from a pretty tall building. It shows a pretty darn big wave. You can't really see any people in this one.
tsunamiphuket.wmv - This one shows an elderly couple being swept away from a railing. Apparently, the man has been found but the woman has not. So factor that into whether you want to watch this clip.
sri_lanka_tsunami.wmv - This one was shot from an upper floor of a hotel, by someone who actually speaks English. :P It also shows some people who stuck around by the end of the water until it started coming in... but they luckily seem to outrun it in this case.