I'm not normally one for re-blogging existing web content but I haven't see these sessions mentioned that much and I think they are excellent so...
The Microsoft Build Conference this year contained loads of Office/SharePoint 2013 sessions focussed on the new App model. If you're thinking of developing some Apps or just want to understand more about the possibilities, the architecture or the security of Apps - definitely give these sessions a watch. All the BUILD sessions are hosted on the Channel9 web site.
What's New for Developers in Office 2013 and SharePoint 2013
Speakers: Keenan Newton, Cyrielle Simeone: http://channel9.msdn.com/Events/Build/2012/2-008
Office and SharePoint 2013 offer a lot of exciting new opportunities for the developer. This session will provide an overview of the new developer features for Office and SharePoint including apps, the new cloud app model, additional APIs for SharePoint full trust solutions and new features for the Office developer.
Building apps for Office and SharePoint 2013 using the web technologies you know and love, Part 1
Speakers: Keenan Newton, Rolando Jimenez Salgado: http://channel9.msdn.com/Events/Build/2012/3-020
In part 1 of this 2 part series ...