At first glance, Wikipedia may look normal today.  The homepage looks like it always does, you can even type in a search and see the results.  But when you click on one of the results, a message pops up that starts with the headline, "Imagine a World Without Free Knowledge."

It's all a part of the internet blackout that many popular sites, including Google and Wikipedia, are participating in to protest anti-piracy bills in Congress.

Google simply has it's logo blacked out throughout its site, while Wikipedia will bring up search results but will not let you access them.

Go ahead, check out the search results for "Cars 108" here, click on WCRZ and see what happens.  After about a second, the message pops up.  The only thing you can learn on Wikipedia today (1/18/2012) is about the SOPA (Stop Online Piracy Act) and the PIPA (Protect Intellectual Property Act).  These acts are designed to protect copyright, but does so in a way that could fatally damage the free and open internet.  This is why Wikipedia, along with dozens of sites, are protesting.