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If Pablo E's last name begins with E.... My friends name begins with C. I talked to two other friends who's names begin with F and Y, mine begins with S (interviews on 15, 21 and before 15 of Apr). All of us had our backgrounds checked and none of us got called and no letters either. I kind of think they call alphabetically. Sounds like they didn't start until the end of the day, around 4ish Texas time. I hope we all get called tomorrow, my guts can't take much more.
Also, to the one reference check question: I can only speak for myself, but they only checked my previous employers and two guys who wrote letters for me.