When Google announced that it would be shutting down its RSS news reader app, Google Reader, a few months ago, there was a strong backlash from its dedicated long term user base. The shut-down led to calls for the creation of clones and substitutes from disappointed users. These alternatives have now begun to come online. Among them is CommaFeed, an open source clone. You can check it out here.
One of my favorite aspects of Google reader was the sharing function. This functionality has not yet been integrated into these initial versions of the Google Reader substitutes, but I am keeping my fingers crossed for future updates.