Okay, not a serious suggestion... just something to share.
My (now) wife and I wanted to be a little different with our wedding invitations, to do something a little nerdy (got married in December too, so practically last Christmas). We ended up getting something like 40 512MB USB drives for cheap from Overstock.com, put leather cording and metal heart charms on them, and put our wedding invitations on those (done in Flash CS3 with Atari 2600-ish graphics and animation, fakey scan lines, animated blocky snow, Commodore 64-ish music, etc. ...never mind the inaccuracies of the mix). Sent everyone the traditional card/envelope invite, along with a USB drive to each household.
Definitely got better responses than what I'd imagine we'd get doing mail-in cards alone, and helped further identify all the geeks in our families. Made a social gathering all the more entertaining for a couple who otherwise loathes social gatherings on a pseudo-grand scale. =P