Get in line to get Google Wave. My students visited
wave.google.com to sign up and the site was s l o w in the hours after the preview appeared on YouTube. Google is keeping this a closed, invite only beta which will build buzz similar to the Gmail rollout.
When you visit wave. google.com you will have to make a choice before your request is accepted:

You get the sense that there will be a priority based on the choice that you make.
Then you toss out some fairly non-invasive demographic info followed by the opportunity to share some freefrom text. Haikus are enouraged.