> Take a look at filesizes. The biggest files usually contain the meat of the program, or at least a dispatcher that points to the meat of the program. main.cc is usually tiny and useless for finding your way around.

This is my #1 pet peeve with GitHub. When I first look at an unfamiliar repo, I want to get a sense of what the code is about and what it looks like. The way I do that with a local project is by looking at the largest files first. But GitHub loves their clean uncluttered interface so much, they won't show me the file sizes!