I'm glad to see an app store coming to the Mac. I had an idea to build an app store for Mac and Windows as a startup a while ago, because I wanted to bring the convenience of Linux package managers like apt to Mac and Windows PCs and include commercial apps. I chose not to pursue that idea, because I predicted that something like this was already on Apple's roadmap and that they would beat me to it. It only made sense, since they already had most of the infrastructure in place with iTunes and the iPhone app store. I guess it turns out that it was a wise decision. (I feel like I should give Joel Spolsky credit for influencing my decision to not pursue that startup with his post on platform vendors: http://www.joelonsoftware.com/items/2009/06/10c.html)