While waiting for Nvidia to release SLI profiles for newly released games is indeed glamorous, it looks like EVGA is taking initiative into their own hands and releasing what they like to call the EVGA SLI Enhancement Patch.
This workaround basically adds SLI profiles created by EVGA before Nvidia adds their own versions to their drivers. According to EVGA, they’re looking to have SLI support for games available within one day of release.
Currently, they’re only supporting users with Windows Vista, but if demand by XP users is great enough they certainly won’t rule out the possibility. If you’re looking to check it out, feel free to download it here (registration required).