The World Socialist Web Site. Official publication of the Fourth International on the Internet. Trotskyist, but not much more biased than, say, the neoliberal The Economist. If you can look past the ideology, an excellent, in-depth source of news; they offer the sort of coverage mass-media doesn't - such as on strikes, Sri Lanka, etc. Their movie and art reviews are also quite interesting. They've also had features on such figures as Diego Rivera and on the Bauhaus.