Really Simple System to System Integration

Microsoft has just released a 0.9 version of Simple Sharing Extension (SSE) that extends RSS and OPML to allow for combining multiple feeds into a common feed and to synchronize data between the feeds.

A great example would be contact synchronization. I have a list of contacts and I share that list via RSS. Other people could maintain their own list of contacts and share that via RSS and by using SSE we could have one combined list. The contacts could also be updated by anyone in the group and my contact list would get updated. Security is an issue that will need to be resolved, but the applications look very interesting.

Here's an excellent example of using this for enterprise application integration.