jiffy boy,
Next time try using "search" and typing in 'thank you notes.' 😉 😉
In answer to your question, yes it is a good idea to send in thank you cards. I guess the reason why you send them in determines whether or not you're kissing up. Most committees ususally meet the same day or w/in a day to evaluate your interview performance/admittance, so even if you send a thank-you card via snail mail, it won't reach them in time. But, if you want to send them a card to thank them for their time and to let them know you had a good time, then who cares about the timing??!! I usually wait about two days and then mail off my thank-you notes. I simply want to thank them for a good time. So, your original intentions in sending the thank-you cards pretty much determine if you're kissing up or not. AT some schools, I hear they get you browny points...
🙂