Feed advertising

No, not advertising your feed but placing advertising in your feed. I've only seen it use sparingly and I've typically unsubscribed from feeds that include ads. Well, now Google has gone and created AdSense for feeds which will only make it easier to place ads in RSS feeds and, in my opinion, only increase ad content in feeds. If I was just a bit more pessimistic, I'd declare this the beginning of the end for RSS. (Luckily, I'm not that pessimistic.)