Intel's high end server/workstation Tumwater chipsets support two PEG slots, even though one is merely an x8 lane with with an x16 interface.

VIA, on the other hand, want to go further, providing full multiple PCI-E (http://www.anandtech.com/cpuchipsets/showdoc.aspx?i=2164), and fully supporting NVIDIA's SLI movement, which calls for multiple cards to be used in tandem to provide increased performance. Their efforts will extend to both Intel and AMD processor solutions.