A couple of years ago there was no book version of the LCK, but a very popular book on the zompist bulletin board was "Describing Morphosyntax: A Guide for Fiel

A couple of years ago there was no book version of the LCK, but a very popular book on the zompist bulletin board was "Describing Morphosyntax: A Guide for Field Linguists", by Thomas E. Payne. It's essentially an overview of all the weird morphological and syntactical features that the various languages of the world exhibit, so it can function as a great source of inspiration for conlangers as well.