What is the story behind Bitcoinica? Bitcoinica was a very popular service when it was operating. What is the story behind it - when was it started, what did it offer, and what hurdles did it face?
I think this is a good summary: http://arstechnica.com/uncategorized/2012/05/bitcoins-worth-87000-plundered/

Even more summarised thanks to freesummarizer.com:


  More than $87,000 worth of the virtual currency known as Bitcoin was
  stolen after online bandits penetrated servers belonging to
  Bitcoinica, prompting its operators to temporarily shutter the trading
  platform to contain the damage.
  
  Friday's theft came after hackers accessed Bitcoinica's production
  servers and depleted its online wallet of 18,547 BTC, as individual
  Bitcoin units are called, company officials said in a blog post
  published on Friday.
  
  In early March, a security lapse at cloud services provider Linode
  allowed hackers to make off with about $210,000 worth of bitcoin after
  they gained unauthorized access to bitcoin wallets stored by
  Bitcoinica and seven other customers.
  
  Strong cryptographic controls ensure that once bitcoins are spent they
  can't be taken back, although a recently published research paper
  reports limitations that allow the same bitcoins to be double spent in
  certain cases (which Bitcoin developers say they've long warned users
  to avoid).
  
  The March heist that hit Bitcoinica also affected several other
  trading platforms that have also lamented the necessity of storing
  large amounts of the currency in liquid form in "hot wallets" to
  automatically cover payout requests made by customers.