Max - You wanted to talk about Poetica sometime this week. Let's do it here instead so other folks can join in :)
When I saw their demo at News Foo this weekend I was really tickled. For one, I used to do copy editing while in school, so I have a pretty antiquated appreciation for proofreaders' marks. (The little swirl to delete. Is there anything more efficient but also flourishy than that?)
I also just think there's something to referring back to real-world memes like those and bringing them online. People ask us all the time why we limit participants in Branch conversations, and my answer is always some variant of, "Think about how many people you can have in a real-world conversation."