Feedzirra is an RSS feed fetching and parsing library that I quite like. For a project I'm working on with a mate we need to be able to parse and receive updates from (potentially) a large number of RSS feeds. Feedzirra seemed the ticket, but didn't have support for itunes style RSS feeds - so I added it.
This was basically my first (well, second, but that wasn't public) go with github, and first contribution to an open source project. Paul Dix accepted my code, and I'm oddly excited about it all.
AND to make things even better, someone has already started to enhance my contribution. Woo hoo!