Reading Usable Help
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Gordon R. Meyer
A lightweight way to track changes
Lightweight text-only markup tools, such as the popular Markdown, have great promise for a solo or small team of writers. However, using text-based tools usually means giving up some niceties, such as detailed change tracking. CriticMarkup is a fascinating new approach to solving that problem. Your Editor or collaborators indicate their changes using a set of simple notations, then you can render the file to a familiar visual display of strikeouts, inserts, and comments. There's even an option to "accept changes" when you're finished.
If you're a Mac user, also check out Fletcher Penney's excellent MultiMarkdown Composer app, which recently integrated CriticMarkup support.