Update: Okay, okay, David Lawson had the patience to build a proper website to do this, so I hereby recommend that you swap Wave invitations over there instead of through my improvised gig: WaveShare.org.
If anybody here is pining for a Google Wave invitation, some friends and I have pooled our resources and are filling requests as they come in. Post a comment here or at Clusterflock, and I’ll add you to the nomination list. Many of our nominees have been able to sign onto Wave within a few hours; you could be Waving by dinnertime!
Don’t know what in tarnation Wave is? This Mashable guide is pretty informative. So far, all I’ve used Wave for is to distribute invitations to Google Wave . . . but it works well for that!