As you probably know, the Google Video Search Engine ( http://video.google.com/ ) now
encompasses other video sites, like YouTube. But if you don’t want to search anything but Google Video, you can go to the advanced search page and specify that you want video only from Google.com, or you can use site:google.com from the home page.

That’s how I discovered that site:google.com works as a standalone search. That’s also how I discovered that Google Video
has something over 4.8 million videos (just over 4.9 million if you turn off filtering). But if you start sorting the results by anything but relevance, the result count drops to about 333. So I couldn’t get a handle on what the highest-rated video was or how many videos have been rated lately.

If you use inurl:video.google.com at Google, you’ll see that the main search engine gives a result count of about 1.5 million pages.