This website is undergoing a 24-hours blackout in protest against the upcoming U.S. law SOPA (Stop Online Piracy Act). This is in solidarity with other blackouts all over the Internet, including Wikipedia, and with the goal of drawing attention on how dangerous are that kind of laws for the freedom of expression. Many governments are currently following this dangerous trend, the threat against free speech is thus global (with other initiatives such as PIPA, ACTA, Hadopi, Loppsi and others). The solidarity to defend it is global as well, the Internet has no frontiers, and each and every individual must have the right to access to any kind of information through the network.
You can find more information there.