I just got in a couple days ago and they haven't given me any invites to give out yet.
Do buzz this topic when you can spread the wave
Someone just told me that they've been reading information all over the internet about Wave and the general consensus is that if you sign up on the waiting list at http://wave.google.com/
you will eventually be invited by Google and then you will get 8 invites to send out to others.
But if you are one of the lucky people who is invited by someone else, you don't get any invites to send out to others.
So I may not be getting any invites to send out for quite some time.
Almost makes me regret being invited by the good folks here at DC. Almost