The Academy of Television Arts and Sciences is putting up a pretty amazing series of archived interviews on YouTube. Of immediate interest to Benny fans is a 3 1/2 (ack!) hour interview with Irving Fein (haven't watched much of this yet), but looks like they'll be adding a lot more.
Just poking around, I clicked on the Suzanne Pleshette interview and she mentions her friendship with the Burnses and Bennys at the beginning of clip 2. Interesting stuff! Pleshette even really liked Mary, who knew?
http://www.youtube.com/user/TVLEGENDS