Edit: Actually, they were easier to find than I thought:
http://www.google.com/search?q=carmack+plan+files
Here's an example of a project log for a current project I'm working on: http://www.labradoc.com/i/follower/p/notes-qualcomm-apq8060-...
My style is more verbose than Carmack's but Labradoc can be used with either approach.
Edit: Actually, they were easier to find than I thought:
http://www.google.com/search?q=carmack+plan+files