Happy to see this mentioned here! My Nim book[1] is also going to be finally published in 2017. Lots of great things to look forward to in 2017 for Nim :)
1 - https://manning.com/books/nim-in-action?a_aid=niminaction&a_...
1 - https://manning.com/books/nim-in-action?a_aid=niminaction&a_...
Some Nim screencasts would be awesome. I would love to make some myself, if only I had the time...