Newbie here.
I've never watched the television series... never knew about it until I read through one of his books.
Actually, I remember  reading the first chapter of SF online, and kinda rolling my eyes. I decided not to read them, despite a friend giving me a good reference.
Well, while I perused my local library, I came across Dead Beat, so I kinda picked it up and read he first chapter of that one.
..A couple days later I finished it. I would have devoured it in one afternoon if I didn't have to go to work..
So I go back to the library, discover the first book, and am now beginning where I should have- at the beginning.
I'm hooked.
Once I finish The Dresden Files, I'll check out his other books.