Google Wave is officially out of beta, so you no longer need an invite to sign up. That is almost certainly why almost no one has been using it, so look for Google Wave to just blow up! I mean, why else would something so complicated and of spurious utility not be popular? [Google via Slashdot]
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I wasn't able to even give away the invites I had.
This will probably just languish in the labs for a long time.