That ship has sailed for me (I provided cards with the envelopes and postage), but since I just finished reading her book and was nodding at everything except when it came to the RSVP...I was curious as to whether anyone who got married fairly recently just wrote the address with RSVP in the left corner of the invite, as Miss Manners instructs. I would never have dreamed of not providing a response card and not paying for postage, but apparently, according to Miss Manners this is rude as you're insulting your guests by telling them they don't know how to write and send a proper written response on their own.
Providing the cards worked pretty well for us; I can count on one hand the number we had to track down whose cards we didn't receive. But I'm really curious now, since I loved absolutely every other section of her Surprisingly Dignified Wedding guide...has anyone actually not provided the RSVP material? If so, how did it turn out? What kinds of responses did you get--personal stationery, phone, Facebook messages, emails?