RSS- Really Simple Syndication OR Rich Site Summary
An application that allows users to "subscribe" to updates from certain websites. Instead of visiting sites regularly to check for new content, you can have the updates sent to you automatically as they appear on the site.
This application makes it easy to keep up to date in myriad arenas. Instead of visiting your favorite (or at least important) sites on a regular basis to check for changes, you can set up feeds to go to one place, where you can quickly scan for news and read only what looks really interesting or necessary. While some of these things can be sent to your email, many people hate to have this kind of clutter in their email Inboxes. What kinds of things can you monitor?
Find a feed reader, AKA aggregator. Some are desktop apps, others web-based. I use Google Reader: http://www.google.com/reader
"Like" your go-to sources on Facebook, "follow" the never-miss columnists on Twitter, and subscribe to RSS feeds from the newspapers/mags you need to keep up with, and that important content is pushed to you, saving you time and trouble.