Themes, especially conference themes, can be abstract and difficult to pin down or, worse, too narrowly defined.
Mark Van Holstyn
Writing on the Wall: Custom Whiteboards for Your Office
Lessons from GiveCamp 2012
Who's reading my file?
The Ethos of Responsive Design
Dog Trainers and Pull Requests
Math Is Not Necessary for Software Development
The Well-Themed Tapestry of MWUX13