Aggregators
Aggregators, such as NewsGator and AmphetaDesk , allow users to subscribe to feeds from sources as diverse as the BBC, Sci-Fi Today, Slashdot and thousands of bloggers across the world. The services work by checking an Internet address at a regular interval, usually once an hour, to see if new content has been added.
The feeds are written according to one of a few competing shared specifications, which are collectively referred to as RSS, which stands, depending on who you talk to, for really simple syndication or rich site summary.
