Ok so I went to newbie to suggest it...
Saved data is the lifeblood of any RPG game. There are few games that don't need to start with a design for how the data will be saved.
Savefiles are quite handy -- but the first time you hit them it's a doozy. I had a whole game ground to a halt for that reason (might go back to it shortly).
I know the book will cover savefiles, but Tom would it be possible to get a tutorial for this?
I'd even be happy to provide one if it would help.