Robby the Robot has also made appearances on TV shows of years past, such as
Twilight Zone,
Dobie Gillis, The Addams Family and many others.
There should be more information forthcoming on Robby the Robot on one of my favorite sites. I'm not sure why it isn't up yet. (Ahem!) But in the meanwhile,
Robby entered the Robot Hall of Fame the same year as C-3PO, 2004. For a list of when he's been seen,
Wikipedia seems to have a pretty good list going.