Hi

I found a book called Going Long by Joe Friel and Gordo Byrn to be really useful. I also liked the Triathlete's Training Bible but found Going Long was more distance specific and contained heaps of other advice that I found useful. I've also seen some useful DVD's by Friel along the lines of the Trianing Bible and it was a good way to take info in.

I went with a friend on a recovery day to Borders book store, settled in with a coffee and reviewed a few triathlon books. it was a nice way to spend some time and I was really happy with the books I chose.

Good luck with your ironman.