I think the best way to promote a video site is social media and social networking, e.g. Youtube, Twitter, and Facebook.
Watermark your videos and make sure you distribute them everywhere you can. Encourage people to share your videos with their friends, family, co-workers by rewarding them for sharing.
Best thing u can do is have great videos! For example if your site features funny videos you need to pay people for original content and then promote it via social media like break.com
put a water mark on you own video and post on some other tube website.Your video also need interesting...