Download videos from youtube in many formats.

I have a website called flvapp dot com the script i have there i bought from a website that sells those scripts for 20. I want a website with good looking design where users will be able to search for videos and download them in all possible formats and also to be able to support "YouTube, College Humor, Daily Motion, Metacafe, Bofunk, Spike, Totallycrap, Kontraband, Pornotube, Redtube, Xtube, Youporn " Or just youtube and megavideo. PS, please i want you to speak fluent English because i had bad experience with other people that don't speak English. Thanks