Well, Mr. P, in today's economic times, I we say...YES! With the cost of weddings going up, we feel that it is absolutely appropriate for you to call those guest who have neglected to RSVP and give their "Yay" or "Nay".
One idea I (Denice) had received while planning my own wedding was to number each response card and then place that corresponding number on my guest list. That way, if a card was returned to me with no name, I knew who it belonged to, and I could weed out the ones who did not RSVP. I did end up calling those individuals who did not RSVP, and believe it or not, there were quite a few who "thought" they sent in the response card or said they did, but it was lost in the mail.
I will say one thing, I ONLY think it is appropriate to call family or very close friends. I do NOT think it is appropriate to call co-workers, acquaintances or other invites that are not close to you. If you did, it may come off as rude or pushy.
If you need etiquette help, I recommend checking out:
Since this is such a touchy subject, we would like to know your thoughts... please share!
Photo credit: my wedding!