I'm currently working in a Revision Control software in Go (While learning the language), I'll push it to Github when I have a somewhat working prototype.
I'm curious too. Semantic diffs maybe? (This change affects control flow, this one doesn't; this change adds complexity, this one removes it.) Something like that would be useful for getting an overview of a project's evolution, instead of highlighting major commits only in terms of lines changed (often just a meaningless refactor.)