
Firstly I'd like to refute your claim of better looking (although aesthetics != better) and better featured phones and MP3 players out there. All the non-iPod players I've seen are pretty clutzy and cheap looking, badly designed with poor layout, UI and stupid features, like superfluous buttons etc.
That's a side issue though.
The real meat of my comment is taking you to task for being ignorant and stupid with regards the NetApplications data. The 9.93% stat refers to Mac OS X users. Not Safari users, not iPhone users, but OS X users.
Since in the same data the Safari count is only about 8%, and indeed the iPhone comes in at a heady 0.8%, clearly it's not the full story here. If you dig into the stats, you'd see that the 9.93% figure counts all Mac-based users, be they Opera, Safari, Firefox, Camino or any other browser.
Oh, and on another matter entirely, since there are currently no self-replicating malicious executables (or "viruses") for Mac OS X, it'll have to be a pretty dramatic rise before we're even close to the 150,000 estimated windows ones, won't it. Something tells me that's not market-share, it's just Windows is shit.
Since Linux is a unix-like system, and OS X *IS* unix, chances are any virus that comes about that can get into Mac OS X and get around privilege execution will also make it's way across to linux too. Strange, hasn't really happened yet.
There will always be trojan style malware that asks stupid users to give it control, there was one in an iLife dmg the other week. But viruses are a different matter, something fundamentally damn-near impossible on a unix OS (note I say "near"). Still, keep dreaming.
Oh, lastly, OS X ships with a good firewall. You need only turn it on (4 clicks from the desktop, IIRC). If a user is too stupid for that, hell mend 'em.