[CrankyPants]

I was thinking of Android in the sense that they didn't make a phone so they could insert ad slots into the basic UI, but you're totally right.

And personally speaking, just last night I signed in to the dashboard, saw the ads, and thought to myself, "So it's come to this: I have to choose between being monetized by ads, or by rootkits. Great."

[Evbn]

JellyBean puts Play ads in the music app, and on the home screen by default, at least on the Nexus 7.

Also, one of the Kindles has home screen ads.