Bleh, and I was just up until 1am last night reading about black-and-white PDF compression schemes for my Kobo :) Technical knowledge obsoletes so fast.

(Well, maybe not that fast: ImageMagick's best-performing monochrome scheme is, apparently, one that was standardized for literal fax machines in the 1980's [0]. A very basic one called "Group 4").

[0] https://en.wikipedia.org/wiki/Fax#Compression