Ever since that fateful day when I took the PSAT as a sophomore and unwittingly said I'd be open to receiving mailings from Collegeboard and their partner colleges (or however the phrasing is that allows them to sell your names to colleges) I've been absolutely bombarded with mailings for colleges that I'm not interested in (seriously, Milwaukee Engineering? I'm looking to be an English major.) and pricey summer programs. So, I think the time may have passed for the PSAT-takers for this year, but if you ever have the choice of opting in for Collegeboard's mailings:
Unless, of course, you actually want your inbox and mailbox to be cluttered wastelands (or if you want to read the 100+ brochures of obscure colleges).
And, on a slightly-related side note, the same motto (JUST SAY NO!) can be applied to plastic. Be sure to write your letters!