I've been playing around with a couple of new collaborative Web 2.0 online tools today. Stixy is a bit like Wallwisher but maybe even more useful. Revizr is a great way to collaborate with other folks on editing a document. It's different to Etherpad since you, the author, retain control of the work but you can allow numerous others to help you mark it up. I'm attempting to use both these tools with colleagues at the moment so can report back later about how effective they are.