Updates to blog post

You're getting a lot of other stuff with this, but the one that matters is edits to your blog post.  Having re-read it, I think there are three things missing:

1.  There have been lots of things like Curriki, and they've all failed - worth mentioning that.
2.  I simply don't believe that teachers can't use a Wiki editor.
3.  I'd add a fourth bullet point to your list of requirements: incentives. Teachers have them - maybe not all of them, but lots of them - while profs might not (strong cultural expectation for them to prove that they know the subject well enough to teach their "own" work, even when they're teaching first-year calculus).

Happy to merge as-is, then add these as comments under my own name to get conversation going, or if you'd like to do another rev, happy with that too.