2009
2007
2006
PlanetMath
by ycc2106 & 6 others PlanetMath is a virtual community which aims to help make mathematical knowledge more accessible. PlanetMath's content is created collaboratively: the main feature is the mathematics encyclopedia with entries written and reviewed by members.
2005
H2G2 - The Hitchhiker's Guide to the Galaxy
by smudie & 1 otherThe Guide to Life, the Universe and Everything, written by people like you.
1
(5 marks)