You're asking the wrong guy here. I'm not really familiar with Google apps. I did check and there are 264 different waves that include "Google Apps", so perhaps the best place to find the answer is on Google Wave itself.
Perhaps you could post the results of your poking around on the question here when you have a clearer picture. I'm sure I'm not the only one who would be interested in the answer to what seems like such a simple question.
I would love to try out Google Wave if you have any invites left. I am an elementary School Based Technology Specialist in Northern Virginia. We're trying to collaborate on ideas for our Global Awareness Technology Projects: brand new school and 11 brand new teachers on staff. My email is email@example.com. Thanks!