Congratulations to Mac Daily News for publishing this article about how recent statistics show an actual Apple Computer Install base of 16%.
I would slightly disagree with the 16% - my own gut feeling is that it is somewhere around 12% - 13%.
Many people confuse install base with quarterly marketshare.
Apple quarterly marketshare (= to # of computers sold in a quarter vs all computers sold) hovers around 4% - it has been very encouraging to see this number slowly creep up since the the introduction of the iPod, iMac, iBook, and now the Mac Mini.
What most "analysts" don't see is that the average PC is in use for an average of 3 years due to quality, obsolescence, or satisfaction. However; Macs are in use on an average of 7 years.
With more and more people looking to get out of virus oblivion - there are big things ahead for Apple.
See this previous Jackwhispers article related to this topic:
What's In Store For Apple