I liked the way that it broke down the barriers between the different methods of communication - you could start with a sort of email, but if someone else was online at the same time you could quickly sort out some details in an 'IM'y kind of way, without waiting for emails to go back and forth (or you could choose to not do it that way).
This falls within one of my areas of research (intelligent email and breaking down the barriers between different forms of communication) and I think it is really taking off at the moment - certainly there's a huge amount of research interest along these themes and not just for personal communication but serious business applications....
But collaborative sudoku, that would drive me nuts :-) Imagine trying to resolve disagreements.... Diana _______________________________________________ Sheffield Linux User's Group http://sheflug.org.uk/mailman/listinfo/sheflug_sheflug.org.uk FAQ at: http://www.sheflug.org.uk/mailfaq.html GNU - The Choice of a Complete Generation