1: Recover GMail, AOL, Yahoo! or Windows Live Passwords

MessenPass is a free password cracking tool that will easily reveal passwords of your AOL, Yahoo! Messenger, Google Talk, MSN or any other instant messenger clients.

2: How to Open Password Protected PDF Documents

Advanced PDF Password Recovery Professional edition from ElcomSoft is a recommended option.

3: Password Safe: One password to Rule Them All

4: Best Tips for choosing strong passwords