Originally posted by MGoBlue13
Also, is there a problem with sending letters of interest to more than one school (pre-interview)? There are 4 schools that I am very interested in attending, and they are all non-rolling... could I send a similar letter to all?
Look at it this way -- the more letters of interest/letters of intent you send out (meaning to multiple schools), the more it loses its power. I think this is becoming an increasingly common trend among applicants, and as a result, I think the letter of interest will lose whatever marginal influence it may have had.
As for sending letters of interest or intent to multiple schools, I think it really depends on how strongly you word the letter. If you write to all the schools that they are "your number one choice, and you would absolutely attend if you were accepted," that could be compromising, and personally I find it somewhat unethical. There is always the chance that you could get accepted by a couple of those schools and then have to go back on your word to one of them. Sure, your letter is not necessarily a legal, binding contract, but going back on something that definitive doesn't exactly make you look good (you never know when you might cross paths with those people again).
If it's a more vague, general, "I really would appreciate the opportunity to interview at your school because...," there probably isn't an issue sending that sort of letter to multiple schools, but my personal feeling is that the more vague the letter is, the less it will matter or make any difference.
My feeling (based on personal experience and that of friends) is that there are really only two scenarios where a letter may actually make a significant difference -- one is the letter of intent following an interview or a waitlist notification; the second is a strongly worded letter of appeal following a pre-interview rejection. In both cases, I believe such letters should be used very sparingly, and ideally, only sent to one school (ie, don't appeal ALL of your pre-interview rejections, but maybe just the one or two schools you have your heart set on AND where you feel you could be a competitive applicant).
Above all, be sincere and specific if you are going to go to the trouble of writing such letters.