Youtube clones

PHP upload progress bar:
http://labs.beffa.org/w2box/demo/
http://trydobe.com/xajaxupload/demo1/
http://www.obokaman.com/p/descripcion-y-fuentes-del-upload-php-ajax-con-barra-de-progreso-1596
http://www.raditha.com/megaupload/
http://tomas.epineer.se/tesupload/

PHP Youtube clone tutorial:
http://anton.shevchuk.name/php/php-cookbook-myphptubecom/
http://www.onlamp.com/pub/a/php/2007/05/24/creating-mytube-with-flex-and-php.html

MPlayer straipsnis
http://blog.kovyrin.net/2006/10/08/lighttpd-memcoder-flvtool-for-streaming/

Lots of video resources:
http://www.flashcomguru.com/index.cfm/video

linux tools

ffmpeg-php
flvtool2
Libogg
Libvorbis
LAME MP3 Encoder
Mplayer
Mencoder

Projects

ClipShare
YouTube Clone Script
Attachmax
Rayzz
Alstrasoft VideoShare
SocialMedia
Video Broadcast Yourself
PHPmotion

Players
http://flowplayer.org/