I guess I am too engrossed with running Solaris alongside ubuntu linux on VMWare Fusion on my Macbook Pro that I never considered running it on Linux. Whilst you can get Parallels and VMWare for Linux, here's another way of getting Solaris to run on Linux using Xen.
Whilst definitely not for the faint-hearted, I still urge you to try it out. Solaris is fast gaining some ground and the upcoming Project Indiana will surely come up with a great Linux competitor on the desktop.
Now, if only we'd get the other non-Microsoft OS to talk to each other and share features, now that will be the day Microsoft dies! :P