The RSS feeds that Radio3 generates, starting in v0.75, have <cloud> elements. This means that people who subscribe to your feed in compatible aggregators will be notified immediately when you post a new item, and can show the news to readers immediately.
Here's my linkblog feed with rssCloud support, as an example.
Andrew Shell has released an rssCloud server for Node.js. We use his server for Radio3 feeds.