Google Wave is a yet-to-be-released collaborative tool. It's so broad, it's difficult to describe but it's Google's vision to how email should be but it goes so much further than that. Four people editing a document concurrently and you see the edits. Emails that are really somewhere between and email and IM, with branching and joining new people in.
Superb. I'll be using it for freelancing for sure.
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Looks interesting sort of bluring the lines between email documents blogs IM and even picture galleries.
It will do everything that lackof does and more and slicker.