Techie wedding invitation ideas

Qa32 writes: "So I am getting married in a few months and being a hardcore techie in the wireless world (yeah, I don't code for a living) and wanted to come up with some novel way of making my wedding invite that will truly have even my mom say.. "wow, that was cool" :)
Has anyone out there done anything similar or thinking of something similar and can share ideas? I already have a few.... have QR codes, have some basic embedded circuit/plate with wire leads that maybe plays a song, etc when you connect a battery, have a way to turn up a display LCD, etc."