I have also been hit by the wait-list wave. I got wait-listed at Columbia, Georgetown, and UCLA all this week. I applied mid-December so it might be the large amount of applications.
... at WUSTL, Duke, Michigan, and Columbia and have a full scholarship ... threat of me going to Columbia which is higher ranked and ... we'll have a exciting Columbia at sticker vs WUSTL free ...
People do that??? Don't think I've ever heard of anyone sending a 'thank you' type of email for an acceptance/scholarship email... I've heard of people doing it after an interview, though.