A simple, open, server-to-server web-hook-based pubsub (publish/subscribe) protocol as an extension to Atom. Parties (servers) speaking the PubSubHubbub protocol can get near-instant notifications (via webhook callbacks) when a topic (Atom URL) they're interested in is updated.
SimpleFeed - feed parsing the easy way :-)
Create an aggregation site which aggregates RSS feeds and outputs them in river of news style pages with the most recent news items first.