An RSS feed which you subscribe to is your personal subscription to a service, just like email.
A private subscription service for text, audio and video content, even involving a paid subscription fee has been possible for more than a year, based upon RSS.

How to Get Better Technology Search Results and News
Carefully Selected News Source
What would be better than Robert Scoble’s OPML file?
The Best Search Technology
Google Custom Search Engine gives great search results, and quite often gives better results than the main index.
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