Used to be the search subscription service was current with available Usenet content -- but with the V6 beta, it's rarely current. Most material I search for is out there, but I'm lucky if it shows up a few hours later in a search, often it takes 24 hours.
Compare the currently available data from this listing to what you can search for with the Newsbin Search service: http://www.binsearch.info/browse.php?bg ... multimedia