Every major mobile platform is now either using WebKit or will be soon. Except for one.

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John Gruber, on RIM’s new WebKit-based browser, the one obvious holdout being Windows Mobile. While I’m a huge fan of WebKit, both in my pants and on my desk, this strikes me as an odd thing to triumph. For one, replace “WebKit” with “Flash” and suddenly the iPhone is the holdout.

More importantly, though, with something like browser rendering engines, I’m philosophically opposed to a monoculture. A few years ago, Gecko was the best rendering engine available, then WebKit came out of nowhere to beat Gecko at its own game, and faster, to boot. Now Gecko and WebKit, on the desktop, anyway, are pushing each other to only get better. I’d love to see that kind of competition in the mobile space as well.