The application converting RSS feeds from different formats (RSS 1.0, RSS 2.0 etc.) to valid Atom 1.0 format, using great Universal Feed Parser python library.
You can consume the feed on URL (In the moment the application is deployed on Google AppEngine):
http://feedomizer.appspot.com/atom?uri=[Your original feed URL]
Example: HackerNews Atom Feed
The application also providing additional service for converting RSS feeds to JSON format on URL:
http://feedomizer.appspot.com/json?uri=[Your original feed URL]
Example: HackerNews JSON