Nice. Though it makes me think it would be nice to have this as a built in code editor minimap feature without the multi line ASCII code. The editor would parse special tags in comments and overlay the minimap with the tag text in big letters.
I think that might be derived from The "#pragma mark" feature that was in the CodeWarrior IDE which could be used to have annotations show in the drop-down list of functions in the code editor
There's even a Sublime Text plugin to generate this text.