SLi on Solaris? It's apparently possible, & the Phoronix guys set it up & get it running on Solaris 10. Maybe had to wait a bit longer than the rest of of the open source distros, but this news will certainly make you happy if you're a Solaris fanatic.

"However, the folks using Solaris from Sun Microsystems had not received SLI support until the most recent drivers released on December 22. Today at Phoronix, we are taking a quick preview and how-to guide for NVIDIA's GeForce SLI under Solaris 10."