So here's a question: Does the 890FX not include a gigabit NIC onboard? It seems like everyone (including Biostar) is still using a Realtek chip. Not that I have anything against Realtek, as I've had nothing but good luck and good performance with mine, but I would think they of all people would save the cash and use the NIC AMD provides!
As for the quad-Crossfire, I suppose it'd be nice for using a few low-end cards to make a cheap Eyefinity array. I don't know that I would quad-up on any of the current single-slot mid-range though... I mean, a 5750/5770 is probably a better buy no matter how you slice it. Granted, if we could get a single-slot 5750, it'd be a sweet little setup for an expandable gaming rig.
Oh, and "BIO-unlocKING" is definitely one of the better (i.e. more hillarious) marketing terms I've heard from a motherboard manufacturer lately. Right up there with "ProbeIt!" from ASUS...