The site
www.pornfuckyou.com is a demo site for webmasters that want to have a play around with TEVS (my script) before they buy it.
Most of the time webmasters use hotlinked videos and it does take a few seconds for it to buffer. Unless they are using uploaded flv videos in which case only buffer for 2-3 seconds.
Some of the videos on that site will not work as their just tests from webmasters to see if their videos work. Once they find out they work they remove the video, hence why nothing plays.
TEVS is being used on over 1000 domains currently and growing every day. But as Antonio said there is other scripts out there.
Some other scripts
http://tubecgi.com
http://www.alstrasoft.com
http://www.clip-share.com
http://www.phpmotion.com
http://www.bigdotmedia.com ( my script TEVS )
I also understand Smart-scripts will be releasing a tube script very soon.