Not open source, but potentially very cool, is FriendFeed. To me, FriendFeed seems to promise to take some of the ‘H’ out of ADHD web browsing and article reading. As the number of separate feeds grows in my newsreader, I am beginning to collect multiple feeds from the same person. For example, I have Person X’s Blog and Person X’s Twitter feed. For Person X in this example, if they had a FriendFeed account, all I’d have to do is subscribe to one newsfeed and collect everything. FriendFeed creates the very cool paradigm of getting a “personal feed” vs. the standard “website feed.”
It’s new, there are things to work out, but it has promise. It also paves the way for other, simplified RSS feed aggregation.