Andrew asks, why Solaris?
Actually there are a number of reasons that someone might consider using Solaris over Linux.
One might be the "lights out management" feature of some SPARC machines, where you can completely control the system remotely, even booting it.
Further, Oracle on Solaris is usually considered the very most stable and reliable way to run Oracle. This may change in the future of course as Oracle puts more emphasis on Linux.
