First let me post this link from reddit since it has better comments than me. http://www.reddit.com/r/Bitcoin/comments/28r68b/notice_of_extortion_context_in_comments/
I also posted the letter below. Watch out! New currencies, Bitcoin, we’re back in square one with the fraud, scam, and threats in order to get the Bitcoin. Similar to any paper currencies and properties. With Bitcoin it’s a litte bit different because the it’s more anonymous harder to trace, but it’s possible with threats like this.