We have just taken a look at ASRock A770 Crossfire motherboard.  While it has two PCIe 16x looking slots, it supports 16x/4x or 8x/8x configurations thanks to a old-school PCIe switch card.  This board comes with basic features such as 8-channel audio and lots of USB2.0 ports, but skimps on firewire and a few other things.  The end result though is a solid board that overclocks very well.  Take a look at our review for all the details.

Title: ASRock A770 Crossfire Motherboard
URL: http://www.bcchardware.com/index.php?option=content&task=view&id=6156&Itemid=40