From
http://marketshare.hitslink.com/report.aspx?qprid=8 (Which is the same source as the article):
SunOS - .01% - I assume this includes Solaris ...
FreeBSD - 0.00%
Even the Wii, Playstation 2, and iPhone score better ...
OS trends over the last year:
http://marketshare.hitslink.com/report.aspx?qprid=9
Please not that this only applies to desktop systems, this survey does not include server systems.
Well, it's still a far cry from a fair, open, free, and competitive market ... But things are moving in the right direction ... slowly...