Google is now offering AdSense for Feeds, after announcing that Feedburner would not be accepting any more applications to the Feedburner Ad Network.
No official announcement has been made, but many publishers are able to access the feature in their AdSense accounts. I was able to do so with mine. Below is a screenshot of the process for signing up a feed:

Related Reading:
Google Gives Away FeedBurner Services
Will Google's FeedBurner Scorch Organic SEO?
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