
News readers allow you to subscribe to and get updates from multiple websites using RSS feeds (more on RSS here or here) and listing them onto a single screen. Instead of jumping from website to website, a news reader will surf your favorite sites and add new content to your subscription, which you can read at your convenience.
There are many news readers available, from free web-based subscription websites like Yahoo and Bloglines, to computer-based and paid subscription services. Find out more about each reader at RSS Compendium or check out Google's page for a list of the most popular ones.