Merlin begins his discussion of Getting Things Done and OmniFocus in Episode 95 of Back to Work. He continues the discussion through the next four episodes:
- 5by5 | Back to Work #96: Compensatory Muscles
- 5by5 | Back to Work #97: Pope of the Office
- 5by5 | Back to Work #98: Bagged and Boarded
- 5by5 | Back to Work #99: Nobody Wants to Live in a Scaffolding
Merlin gave a demo of OmniFocus at Macworld in 2012.
Mac Power Users has had a few episodes about OmniFoucs.
- Screencast 001: OmniFocus (part 1 of 3) « Mac Power Users
- Screencast 002: OmniFocus Ninja Tricks (Part 2 of 3) « Mac Power Users
- Screencast 003: OmniFocus Ninja Tricks (Part 3 of 3) « Mac Power Users
Merlin also appeared on Mac Power Users to discuss his workflows and OmniFocus.
- MPU 023: Workflows with Merlin Mann « Mac Power Users
- MPU 046: Workflows with Merlin Mann II « Mac Power Users
And as a bonus he included a picture of all of the contexts he uses.