Actually that's a Rev. 3 (heat pipes). The sheet that came with it says rev 1. I think they kept that same sheet for most of the newer orders. Keep 'er cool!
Interesting. I thought all the Rev. 3's had a second fan installed on the bottom. Auto-tuning it now with BFL software to determine the proper bitstream.
On another note, I've received an email from Butterfly Labs saying that our next 2 BFL Singles have shipped and we should receive them by Monday.