Check out Letters at http://sandbox.projectalpha.co.uk/letters/
Sorry it's quite slow, but yeah it works again!
Letters is a multi-user playboard, almost like a worldwide fridge with little green letters which can be clicked and dragged around the screen by all whom are connected. The infuriating thing is that as you're trying to spell your favourite words, some other innocent person is trying to steal your letters to do likewise!
A dastardly way to spend a lunch break, or two ... but it isn't half fun!
More to come here later!