Intel X38 may support both ATI CrossFire and NVIDIA SLI technology. The first board that might support it is the Foxconn X38A. The photo below shows that this board supports ATi CrossFire and Foxconn Multi graphics support for NVIDIA graphics set up. Although it didn't mention SLI, it seems that there is a high chance that this board might.
It now depends on whether NVIDIA will license its technology to run on 3rd party chipset after its miserable attempts in breaking into the Intel marketshare with the 680i and 650i series with SLI.