Zach Holman, who has to keep reminding us in this post that he’s _not_ a designer, offers some valuable and instantly usable tips on slide design. The concluding para, for the [TL;DR](http://en.wikipedia.org/wiki/Wikipedia:Too_long;_didn’t_read) crowd:
> I’m certainly not a designer, but it’s really remarkable how little design you need to put yourself far ahead of most talks. Huge text. Consistent colors. Less words. Worry about those, and it will already put you far ahead of the pack.
Take a look at his [building GitHub with GitHub slides](http://zachholman.com/talk/how-github-uses-github-to-build-github) for an example.