I agree, I'm an obsessive editor and usually make multiple revisions to comments I leave on various blogs, HN, forums, etc. I should probably get in the habit of writing in a doc first, but I don't really feel like putting in the extra step for stuff that's usually rather trivial. If I was an active blogger, I would likely try to use this tool on a regular basis and link to it at the end of every post.

Thanks for sharing, very awesome to watch. My only request would be the ability to adjust the playback speed.