This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
As for books, I didn't find the Little MongoDB Book very useful as it's quite out of date. But there are lots of online tutorials around, and the MongoDB Applied Patterns book is very handy too.