Quick and dirty Node.js overview given to the mobile team at Tumblr on 4/30/2014. This doesn't have anything to do with mobile per se, but centers on why developers who rarely have time to do web development would be well suited to pick up Node.js for the times that they do.
These slides were creating using Deckset (http://www.decksetapp.com), and the source can be found here: https://gist.github.com/irace/ec0ce0faaadf00ccaddb