In the current issue of the German “ix” magazin there is the first (of three) parts of a nice vCenter Orchestrator tutorial. Buy the issue in paper at your favorite newspaper store, or online (you can also just get the single article): http://www.heise.de/ix/inhalt/2013/9/112/
The authors of the article, Jens and Guido Söldner, are also teaching a two day instructor-led hands-on workshop focusing on vCO and vSphere automation These are taking place in Düsseldorf and Munich starting at Sept. 10th and Oct. 10th 2013.
Get details and book your place at http://www.amiando.com/vmworkshop2013.html
Steve Jin: VMware VI and vSphere SDK
David Flanagan: JavaScript – The Definitive Guide
Marijn Haverbeke: Eloquent JavaScript
Cody Bunch: Automating vSphere: With VMware vCenter Orchestrator