While the parent poster didn't mention games, a lot of the recent award winning games that truly do innovate (vice this year's fresh paint on leading Windows titles) are cross-platform. And of course Firefox, Filezilla, Thunderbird, Google & Open Office have all been complete flops- they'll never draw a crowd. MS is losing 10% browser share a year. It won't be long now.
Speaking as a developer I could never go back to MS-Land. I've grown fond of a desktop that responds when I click instead of searing the Windows hourglass into my retina.