I think the folks presenting at TED.com would be great interview subjects!
Keep up with that, at least once a week, if possible. It gives some perspective to the show.
I would suggest some interview regarding "the future of tech" (or what people who is seen as to know something about believes is the future of tech). Focusing on consumer electronics, if i'm not wrong, the end of the phisical storage formats and the convergence of portable devices has already started to develop. Appart from that, and some quantitative developments is all that's been going on for a while. Nothing NEW, I believe.
What are people who thinks the future is ... thinking for the future?
What are the thing already invented that will be everywhere in 5-10 years?
If not an interview in the show, lets have a thread about it