According to The Inq's sources the upcoming Intel X38 chipset will do SLI:
To say we don't hold NV in high regard is far from understating the case. The firm is seen by most journalists as slightly lower on the 'happy things' scale then finding infected leeches on your genitals after a swim in the sewer. We didn't think it could be possible, but their standing dropped even further when we found out that Intel's upcoming X38 chipset will do SLI.
Now we are sure that NV will deny it up and down, but seeing as how they have trouble with anything relating to the truth, I would urge the reader to ignore them. The engineers tell us that SLI drivers are in the final state of polishing with a few bugs left to quash, but plenty of time remains to finish things up.