Independent Media Center (ww.indymedia.org) is a network of alternative new media. The first one was created in Seattle to cover the protests against the WTO. Nowadays, there are more than 25 centres in some countries, though most of them are in USA and Europe.
There are two types of IMC: the ones who are created for a global action (for example, the IMC-Prague), and those who want to be permanent and inform about activities and points of view that aren't in mass media, like the folks of London.
In Barcelona we're creating one with the second goal.