Membership is FREE, giving all registered users unlimited access to every DNForum feature, resource, and tool! Optional membership upgrades unlock exclusive benefits like profile signatures with links, banner placements, appearances in the weekly newsletter, and much more - customized to your membership level!
Also, please see this note from Wave's invite page:
Google Wave is more fun when you have others to wave with, so please nominate people you would like to add. Keep in mind that this is a preview so it could be a bit rocky at times.
Invitations will not be sent immediately. We have a lot of stamps to lick.