I just saw a banner on Gizmodo that looked like the card I got. Link took me here. There's more puzzles like this one. And, as I thought, I'm not the only one trying to find the answer.
I'm still clueless but at least there's a destination. Read the first Strange Mail post.
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http://forums.unfiction.com/forums/viewtopic.php?t=25684
It is a viral marketing campaign for "tru blood," a new show on HBO.