my preteen son attends a private school w/ parents that should know correct manners but...still I have trouble w/ RSVPs! It has been a pet peeve.

I like to use evites on-line, it worked wonders for me. For those of you who like to send a "formal" invatation, just do both! When I first sent it out only a few people responded and once it got closer to the party evites gives you an option to resend your invatation as a reminder to only the people who havent responded yet. It worked wonders for me!