How do I find specific programs, such as Jeopardy, Wheel of Fortune, O'Reilly Factor, Stossel, Freedom Watch/Judge Neopolitano, etc?
Roku doesn't work that way. Netflix provides access to specific services such as Netflix or Amazon. You have to search for things on those services. For example, both Netflix and Amazon have searches from the Roku.
Amazon has some current TV, but usually not daily shows like Jeopard and Wheel of Fortune. I'm not sure if Hulu Plus will or not.
I'm not sure if any of your shows are available on the Roku -- perhaps O'Reilly is on Informagator?