Yesterday, I was down at Big Lots and I picked up (for $5) this 4-DVD set, THE UNKNOWN COLLECTION.
It has PBS documentaries on Jimmy Durante, Jonathan Winters, the Marx Brothers & Peter Sellers.
I watched the Durante one, and it's terrific; contains many, many clips from his 1950s TV show with guests like Frank Sinatra, John Wayne, Donald O'Connor, Sophie Tucker, etc. If you love Durante, as I do, you will want to see this one.