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But that looks like a very handy little resource for you Windows users at any rate... hehe. Thanks for sharing. :)
Only one of the nice touches in Opera. Even if it's not your default browser, I feel it definitely beongs in every webmaster's tool kit.
It also may be worth noting that the monitor's physical size (15" in this case) will not play into the decision at all. The issue is the screen resolution in pixels, not its physical size.