Linux is only free if your time has no value.
Today, I use Linux as my primary OS (on an x86 PC, and on a Thinkpad), and I also use Irix (on an SGI O2). Linux has improved a great deal since I wrote this, specifically with respect to its ease of installation.
I think Linux is a great thing, in the big picture. It's a great hacker's tool, and it has a lot of potential to become something more.
Mostly I use the O2 as an X terminal, however, running my apps on Linux and displaying remotely.