Hmmm.....This sounds similar to what I did with my site...though I did all the information myself rather than asking them to post it. Most of the sites I contacted were good about passing along the info. or giving me access long enough to pull the info. myself.
It was more on the consumer side that problems arose. While there were some people who actually paid attention and went to the individual sites if they saw something they were interested in, quite a few people were writing me yelling that they couldn't access the clips. Even though I was VERY clear that it was simply a directory of what others had and not the place to get the actual clips, they wanted me to provide it all. LOL I guess you can't win with some people.
Anyway, good luck if you decide to do something like this. It's a good service to the community if people use it properly. If you're interested, I can send you the file with what I had. It needs updating, but would give you a good start on getting the info. out there. Drop me a PM if you're interested.
Ann