[z999]

He has an earlier blog post on how he designs his slides. Not extremely informative but csn give you couple of tips on how to get that zach holman look. Iirc it was in response to the how github uses github to build github talk.

[cenhyperion]

Here's the blog post I think you're referring to.

http://zachholman.com/posts/slide-design-for-developers/