The MacSparky “Photos” Video Field Guide
Photos for Mac delivers the goods and David Sparky's new screencast teaches you how to get the most out of it.
MacSparky’s Workflow Video Field Guide
An hour-long screencast by David ("MacSparky") Sparks that will teach you to master Workflow for iOS.
OmniFocus Video Field Guide by David Sparks
The best way for newbies to ease into the world of capturing and processing tasks in OmniFocus.