Oh, and just to be on topic, I sent zero thank you cards and got into all the schools i interviewed at... I think it's just a judgement call, though, and depends on whether it a big group interview day (after which you can barely remember which admissions committee member interviewed you) or something smaller and more personal. Jsut so you don't think i'm a heathen, I did completely mean to send thank yous, however I was graduating, finishing my undergrad thesis, and life was crazy this fall/winter *sigh* I'm happy to have made it though alive