Ubuntu is already working on integrating commercial software. Of course payment is one aspect, but the aspect of usability and "unpolluted computing" is another one. I mentioned in the article that apt is not perfect yet - but neither is the App store.<p>Also there are high quality apps that are free, so clearly developers being able to charge is not a necessary precondition for good software. I have nothing against charging for software, and clearly it helped with the explosion of the App store. But the point is, the app store is not the only way.<p>Also, which commercial applications that cost money from the app store are essential?