• It's a natural tool for committees that have too much to do, not enough communication and people who can't make every meeting.  Posting a proposed meeting agenda to Wave before the meeting allows for instant changes and for committee members to add ideas, or even discuss some of those ideas before they are added to the agenda if they do not really need to take time out of the meeting. Additionally, running Wave during the meeting while hosting absent members through either the Google Voice or Google Video apps makes the likelihood of attendance higher on some of those crazy meeting days
• Wave allows for two people who are spearheading a project to work on it, and still have the committee chair or director/board members watch the feed to know what's going on if they need to.  Wave's ability to respond to conversations in thread format allows board members or association directors to clarify points, redirect progress and to answer questions in a forum that does not allow for a misinterpretation of the answer given.
• Constant status feeds of the progress (or lack there of) let leaders know if the projects are moving forward or if they've stymied, as so many do.  This information might also be exceptionally helpful for catching those small roadblocks and finding ways around them before they completely stop a project and people lose interest and wander off
• Since studies have shown that Gen Y works excellently in a collaborative environment, why not use a tool that will encourage participation from those "leaders of tomorrow" that we need to tap before all of our baby boomers retire?
• It's FREE, whereas for many online collaboration software solutions, you'll be laying down some serious cash.  Free fits in any budget.