Add information about /pwarps, I would even go as far as including Diana's pwarp in the book.
As was previously mentioned, change the V-shop guide to Chestshop guide.
Rewrite the "Become an Athlete" section about parkour. Say, the rewards are reset weekly and there are many courses. (There are many "sporting events" around the spawn is kind of inappropriate in that section and not even true)
Add Kitpvp section/Skyblock section, change /warp pvp from "Arena" to "Terrarium"
In the section about Towny commands, say, that a full-ish list can be found in the /warp beta location.
EDIT: And please, update the Server information on all the voting sites. There is outdated information there as well.