With Salesforce1, if you’re a Salesforce developer, you’re now also a mobile developer. To help you on your journey of Salesforce1 development, check out the Salesforce1 App Developer Guide. This is the book that I worked on along with many other talented folks here at Salesforce.
via Developer Force Blog.
This is kind of old news if you attended Dreamforce 2013. But since I didn’t, I had a bit of a time tracking it down.
Once I’m through the 12 Force.com workbooks, this is the next book I plan to tackle.