Dear D&C:
--Without a doubt the best suggested guest is Steve Wozniak. I would put him at the top of the list and keep him there, until you get him. I know you could not pay Mr. Wozniak anything much, and I doubt he needs money very badly. Reportedly, he enjoys teaching children, Your program could be part of that effort. Also, perhaps you could get a sponsor for the program, and have the sponsor make a donation to one of Mr. Wozniak's charities. The people of the EEVBLOG community are sho' 'nuff his kindred spirits. If you manage to get him, make sure to pre-publicize, because the listenership potential is tremendous, stupendous, colossal.
--If you cannot get him right away I recommend you have a tribute program. You could summarize excerpts from his biography, and recount interesting stories about him and the beginnings of Apple. You could also interview some of the people who have worked with him over the years (be careful here).
--If you manage to do either of the above, needless to say, some preparation will be necessary. If you get a really bang up program out of the deal, you could, after suitable editing, post a YouTube video by adding an occasional picture of Steve, the Apples, etc.
--This man is one of the most important inventors of the last hundred years, certainly in the top ten, heck, probably the top 5. He is to the personal computer what Philo T. Farnsworth is to television. The next WOZ could very well be in your audience.
--Doing tribute programs could be a way of having guests that you cannot get. So my last suggestion is for you do a program in tribute (an homage if you prefer), to Philo T. Farnsworth. This would allow D&C to get down into the weeds, and discuss some of the technical aspects of TV, and analog vs digital, bobs your uncle.
--If you ever need help with research for a project like one of the ones above, just PM me with a precis, giving me an idea of what you want, how much you want and how you want it, and I would be glad to help, Pro Bono.
--Please remember my idea about getting an "out and out" charlatan on your air, and laying the wood to his ass, after a suitable lulling. Nothing libelous of course. Best Regards
Clear Ether