Re: New Linux kernel 2.6.34 supports GPU "Hybrid SLI"
Im not sure it will work with the proprietary nvidia drivers. They talk about Atis and Intels - probably the nouveau driver will support this feature for nvidia cards if it will be finished.
This is about the open source drivers included in the kernel.
If you use the proprietary driver it must support the vga_switcheroo thing, but i doubt it that it wil happen anytime soon.