I'm really pleased you're doing this! It's a great idea - vidding has become much more prevalent and popular as the technology has become more accessible and lots more people are doing it.

Regarding the linking policy - surely if a vid is on an open website and openly linked to from that site then that should be taken as an invite for people to view it and link to it with no extra permission being required? I know that's the view I take on my own vidding site. If, however, the vidder operates a policy of viewing by permission only, or if the vid is on a blind URL that isn't linked to from anywhere else, and cannot be reached unless you've been sent the link by email, then the maker of the vid should be contacted to see if they mind the link being given out.

Just my thoughts - there might be some other privacy issue that I'm not aware of.