I only read "Foundation and Earth" before the show began (that's what was on hand where I was, I had little choice, as much as I hate starting in the middle of a series), and that book is VERY different from what I'm reading in the first book and what's in the TV series, and would indeed make for a pretty interesting show or at least a movie.
It's literally about three people's journey across the cosmos to discover the origin of humanity and really, very little of the original story re: Seldon comes into it. It makes me wonder what happens in between.