Sir Trevor Editor
I like the "block" abstraction. It seems like a good way to visually work with structured content. It also makes the editor really easy to customize (at least conceptually), which I find a <i>big</i> plus.<p>At least in the example, there did not seem to be a way to undo things. This is a bit annoying, especially because it forces a confirmation step when deleting things. I think most common use-cases would be much better served by being able to undo a delete than having to confirm it each time. Even if you don't want to have a general undo button, I would prefer a GMail-style undo link that only pops up after you've deleted something to the current behavior.