This might be old news, but I just saw that Asus has added the A8N-SLI motherboard to their website.  This of course is their nForce4 SLI motherboard that supports dual PICe graphics cards.  Expect an article on it very shortly.  Here is the specification list:

	CPU Socket 939 for AMD Athlon 64FX / Athlon 64 AMD64 architecture enables simultaneous 32- and 64-bit computing Chipset NVIDIA NFORCE4 SLI Front Side Bus 2000 MT/s Memory - 4 x 184-pin DIMM Sockets support max. 4GB DDR400/DDR333/DDR266 non-ECC un-buffered DDR SDRAM memory - Dual Channel Memory Architecture Expansion Slots - 2 x PCI Express x16 slot *SLI mode : both x16 slots operate as x8s *Default mode : one operates as x16 and the other as x1 - 2 x PCI Express x1 - 3 x PCI SLI Dual PCIe x16 slot support two identical SLI-ready graphics cards Single PCIe x16 slot supports all PCI Express graphics cards ASUS EZ Plug ASUS SLI Warning LED ASUS PEG Link for dual PCIe graphic cards Storage/ RAID NFORCE4 Storage: - 4 x SATA 3Gb/s - 2 x UltraDMA 133/100/66/33 - NVRAID : RAID0, RAID1, RAID 0+1 and JBOD span cross SATA and PATA Silicon Image 3114R RAID controller: - 4 x Serial ATA with RAID0, 1, 10, 5 (RAID 5 software patch available, no WHQL) LAN NFORCE4 built-in Gbit MAC with external Marvell PHY : - NV ActiveArmor - NV Firewall - AI NET2 MARVELL PCI Gbit LAN controller : - AI NET2 Audio Realtek ALC850, 8-channel CODEC Audio Sensing and Enumeration Technology Coaxial/Optical S/PDIF out ports on back I/O IEEE 1394 TI 1394 controller supports 2 x 1394 ports USB Max. 10 USB2.0 ports ASUS AI Proactive Features AI NOS(Non-delay Overclocking System) AI NET2 network diagnosis before entering OS Overclocking Features - AI NOS (Non-delay Overclocking System) - AI Overclocking (intelligent CPU frequency tuner) - CPU, Memory, and PCIe x16 voltage adjustable - SFS (Stepless Frequency Selection) from 200MHz up to 400MHz at 1MHz increment - Adjustable PCIe frequency from 100MHz up to 200MHz at 1 MHz increment - Adjustable FSB/DDR ratio. Fixed PCIe/PCI/SATA frequencies. - ASUS PEG Link for single/dual graphics cards - ASUS C.P.R.(CPU Parameter Recall) ASUS Special Features Post Reporter ASUS EZFlash ASUS CrashFree BIOS 2 ASUS Q-Fan2 ASUS MyLogo2 ASUS Multilanguage BIOS ASUS Instant Music ASUS SLI warning LED ASUS SLI Plug BIOS 4 Mb Flash ROM, AWARD BIOS, PnP, DMI2.0, WfM2.0, SM BIOS 2.3 Back Panel I/O Ports 1 x Optical + 1 x Coaxial S/PDIF Output 1 x PS/2 Keyboard 1 x PS/2 Mouse 1 x Parallel 1 x RJ45 4 x USB 2.0/1.1 8-Channel Audio I/O Internal I/O Connectors 3x USB 2.0 connector supports additional 6 USB 2.0 ports 1 x IEEE1394 connectors 1 x Paraller connector 1 x COM connector 1 x GAME/MIDI connector CPU Fan / 2x Chassis Fan/ Power Fan/ Chipset Fan connectors Front panel audio connector Chassis Intrusion connector CD audio-in connector 24-pin ATX Power connector 4-pin ATX 12V Power connector Support CD Drivers ASUS PC Probe - PC Health Monitoring Software ASUS LiveUpdate Utility NVIDIA nTune Utility Anti-virus software (OEM version) Accessories 1 x1-port IEEE1394 module 8 x Serial ATA cables 1 x SATA Extension module for external devices 4 x 2-port SATA power cable 1 x 2-port USB2.0 / Game module 1 x COM Port module 1 x UltraDMA 133/100/66 cable 1 x IDE cable 1 x FDD cable 1 x I/O Shield User's manual Setting Sticker WinDVD Suite Form Factor ATX Form Factor, 12"x 9.6"(30.5cm x 24.5cm)