They even have envelopes! And I get to geek out by customizing the colors, fonts, liners, etc. Remember how I used to complain that no one ever RSVP's? Since all it takes is a click, I now get accurate counts of how many people will be attending. It's awesome.
This isn't a sponsored post or anything, I just really appreciate how they've taken e-cards to such a sophisticated level. Try them out! They've got some great New Year's Eve invites. :)