Just to answer a few questions:
Gift or Ornament Exchange? Ornament! But of course, if you decide to slip a little something extra or different in your package, that's up to you!
Secret or not? I guess it would be a secret until you reveal yourself when you send it. A point of this is to make/renew friendships - hard to do that if they don't know who you are!
Your recipient's address - if my email to you did not include an address, let me know, because I have everyone's address. Gmail seems to be a little persnickity on forwarding a thread of email, or maybe I'm just dumb.
Is it too late? - I have heard that some intended to join but missed the deadline, and another beat the deadline but her email landed in the Spam box and I didn't notice. If anyone still wants to play, email cardibloggerholidayxchange ^~at~^ gmail and I will try to hook everyone up.