Awesome, I saw a ping about it on the Discord for Nim, I'm probably going to be buying this. Nim hits a sweet spot for me as someone who did Python full time but yearns for something that just compiles natively. I'm fairly impressed with Nim.
Congrats to Araq the author of Nim and this book! No e-book version at this time... sadly my poor vision precludes my buying the book until an e-book version is available ;(