That was actually a really cool interview. Too bad people like Skyjedi won't listen to it on account of it being from TFN (though I must admit, the over long excessive opening with random clips from various movies is really annoying, but once you get past that bit, it is well worth listening too.
Prowse even talks negatively about the prequels, dismissed the Clone Wars series, talks about George being a strange director, and says he though Hayden did an awful job as Darth Vader and looked like Frankenstein. Prowse said that he actually wanted to do the part and was available to do the part, but it was in Hayden's contract that he could play the role of Vader if he wanted too. It is ashame really, it would have been excellent to have had Prowse in the suit and on the screen again.
Also, I found it cool to learn he was the man behind the suit in Rebel Assult II. I knew it was JEJ's voice, but I had no idea they actually went through the trouble to have Prowse wear the suit.