Stolen Credit Card Markets; Passwords; Usernames

Stolen Credit Cards Go for $3.50 at Amazon-like Online Bazaar
http://www.bloomberg.com/news/2011-12-20/stolen-credit-cards-go-for-3-50-each-at-online-bazaar-that-mimics-amazon.html

The science of password selection 
http://www.troyhunt.com/2011/07/science-of-password-selection.html

How Your Username May Betray You
http://www.technologyreview.com/web/32326/?p1=A4&a=f