Status update:
I've gotten a fair number of postcards. I've sent confirmation E-mails to the senders when I was able, but there are a few cards I can't resolve to an E-mail address. If you send me yours over five days ago and are wondering if I got it, E-mail me with your name and I'll give a yea or nay.
I'm hoping more postcards come in before Thursday, when I leave for D*C. If you've been hesitating, there's still time, although you might want to send them Priority Mail to make sure they get here by Wednesday.