Doesn't Vimeo do pretty damn well with this? Or are you looking more for snippets of animation/shots, instead of Vimeo's YouTube length videos?
The reason I say this is because in the past week I started looking for video animators/designers (I don't even know what the right name is) who can design/create a 5-10 sec intro + ending animations/videos, and Google isn't the best option. I'd love to browse through dozens of snippets a la Dribbble in order to contact those companies/freelancers I find their work appealing.