It's three things:
* A cross platform desktop app
* Gmail plugin
* iPhone app
If you create a task for someone not using the system, it'll send them an email instead. Any replies to that email will get turned into comments in Taskforce.
I think you're right about representing it as a story, perhaps a life cycle of a particular task.
Maybe it's because I came in from the HN link, but I was extremely confused by this. I had never seen the draft page before so when I saw the task for "put together draft like product page", I was trying to understand what that meant and find a reference and the page was obviously not helpful so I had to read the HN comments and go find the draft page to get it. Perhaps the same idea of screenshots would work better with a different example that doesn't require as much background knowledge.