This video is an introduction to the science behind password cracking. If your curious about what it’s all about, then this video is for you!
500 Worst Passwords of all time:
http://www.whatsmypass.com/the-top-500-worst-passwords-of-all-time
Appnimi PDF Unlocker:
http://www.appnimi.com/file/pdf-unlocker
Password complexity cracking stats:
http://www.lockdown.co.uk/?pg=combi