Solaris is dying, but it's because of the hardware. The "big iron" sparc hardware is simply obsolete. Paying tens of thousands of dollars for a 2ghz sparc system is looking less and less attractive. Solaris x86, of course, cannot compete with Linux. AIX is still relevant due to the great LPAR virtualization and great POWER hardware. Nothing from HP or Sun comes close.
Saket writes: "The Sony Playstation 3, Xbox and Nintendo Wii have captivated a generation of computer gamers with bold graphics and rapid-fire animation. But these high-tech toys can do a lot more than just play games. At North Carolina State University, Dr. Frank Mueller imagined using the power of the new PS3 to create a high-powered computing environment for a fraction of the cost of the supercomputers on the market. Mueller, an associate professor of computer science, has built a supercomputing cluster capable of both high-performance computing and running the latest in computer gaming. His cluster of eight PS3 machines — the first such academic cluster in the world — packs the power of a small supercomputer, but at a total cost of about $5,000, it costs less than some desktop computers that have only a fraction of the computing power."