You should take a look at Unbounce. While they're targeting landing pages, their page editor does this the right way IMO. What I'd personally like to see is a

You should take a look at Unbounce. While they're targeting landing pages, their page editor does this the right way IMO. What I'd personally like to see is a JS in-browser page editor that is (a) built on top of Twitter Bootstrap (b) open source and (c) integrate-able with other sites much like rich-text editors are. I think you could still tack on a paid service to it, but starting with the above would be gold, Jerry, gold!