2.5Mb of Wikileaks Cables Embedded in the Bitcoin Blockchain
John Robb, a writer at Resilient Communities, just tweeted that a large amount of Wikileaks cable data has been embedded in the blockchain.
There are indeed methods for embedded text in the blockchain, the most famous being Satoshi Nakamoto's entry in the first block, "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks."
Some worry that child pornography could be stored in the blockchain, thus implicating anyone who downloads it, though the illegality of that is rather questionable.
via http://www.thebitcointrader.com/2013/04/25mb-of-wikileaks-cables-embedded-in.html
