At Rightriot.com, we've received a number of Google Wave invites. We thought about several different ways to get them out there. What we finally decided on was a lottery.
To be entered into the Wave invite lottery, link to us off of your site or blog. Then email us at firstname.lastname@example.org to let us know that you've done so and give us the address of your blog.
We will be getting more invites and we would like to get one out to everyone who links to us. Right now we have only ten. We will be running one lottery per day.
Also you can enter as many times as you want but the links will need to be on different sites that you control, eg not in the comments section of other blogs, et cetera.
Good luck to all and join us at rightriot.com for conservative news and commentary!