How to Create Strong Passwords?

The strongest password is in fact a "Blank" password in certain situations. From the below article, Microsoft describes why "Blank" password is best for those situations.

A blank password (no password at all) on your account is more secure than a weak password such as "1234". Criminals can easily guess a simplistic password, but on computers using Windows XP, an account without a password cannot be accessed remotely by means such as a network or the Internet. (This option is not available for Microsoft Windows 2000, Windows Me, or earlier versions).

Do read further to learn on the pros and cons of a blank password.
http://www.microsoft.com/protect/yourself/password/create.mspx

Help protect your personal information with strong passwords
http://hongjun.blogspot.com/2006/04/help-protect-your-personal-information.html