I have discovered, on Beni Petris' webpage, a fine listing of books about darts and I have taken it and converted it into a google sheets document that anyone can view, here:
Needless to say I have barely made a dent.
I recall discussing the idea of books about darts with a good friend and (at the time, anyway) teammate of mine who quipped that, for most dart players, the idea of reading a book about darts is about as foreign as the idea of reading a book about drinking a beer. To some degree I agree with him. I recognize that I am different in that 1) I developed a love of reading at a very early age and I have always been a voracious reader, and that 2) I am not just a typical league darter. I am a darts aficionado, and I have the collector gene, which prompts me to collect not just dart stuff, but books as well.
What really turned me on to reading about darts is not a desire to get better (although I have that desire) but rather the WYBMADIITY section of Silberzahn's book.