I have been doing BFIAR with my 3 year old son for about three months and we love it. I just pick and choose what works for us from the book. I also spend about 1hr on Satudays looking at some blogs and printing things out to go along with that weeks book. I read the books to him as he is finishing eating his breakfast (he eats very, very slowly) then we do games, art projects and other stuff we are working on.
I have found the book choices to be awesome. I find a lot of them at the library, but because we end up loving them so much I end up buying them to add to our home library. My son will ask me to read the books at lunch and dinner too!