RSS & Feeds
RSS feeds are the mechanics behind news distribution to your desktop. Bring news and updates from across the web for reading in the one place. Can you imagine doing it in any other way? RSS functionality is now ubiquitous although still underutilised by many information specialists.
Google Reader
For me, this is the most useful online RSS reader. It integrates well with Feedly to present feeds in a magazine format. Simply subscribe to blogs, news, search results, etc to 'pull' them into the one convenient site.
Comparison of feed aggregators
Bloglines
One of the earliest RSS readers, this is not the original Bloglines. It's being re-invented after change of hands.

