I created ExportMyPosts after the Posterous acquisition so people could export and backup their blogs' data - http://exportmyposts.com/ - it has made more revenue than it costs for the hosting and servers, but not enough to pay a salary or anything. There are a few promo codes left, use HACKERNEWS at checkout.

I also made StepStats - http://StepStats.com/ - for better FitBit data visualization; it's free, but enough people have donated money that it has covered all costs involved.