Here's another of ol' Sarges favorite sites. I found this the end of last year. Since I do video editing it has come in pretty handy. You can't beat these clips, nor the terms Stockfootageclips
Interesting, I guess its a natural progression stock photos to stock video.... I should have seen it coming. Will be interesting to see how successful it is compared to Stock Photography.
It's a boon in the video editing world. I have used a few, as video backgrounds for the lead in title. They are exceptional quality, but they do take up a lot of space, as the previous person suggested.
Don't know what you could use them for on websites, but thought I would pass it along for what is worth.