but how come all these other guide nerds haven't hit upon this little thing? Or have they?

I only have the books I've found second hand, so that is Restaurant, So Long and Thanks For All the Fish, and Mostly Harmless, which suited me fine at the time because the latter two were my favorite.
*looks on bookmooch*
[edit- they have like 20 copies of it there. anyone else want one ?xD]