How to make strong, easy-to-remember passwords Safe and Secure - CNET News:
"One way to create a password that's hard to guess but easy to remember is to make up a phrase. You could type in the entire phrase (some sites let you use spaces, others don't) or you can use the initials of each word in the phrase, for instance, 'IgfLESi85' for 'I graduated from Lincoln Elementary School in '85.' An even better one would be 'MbfihswE&S' for 'My best friends in high school were Eric and Steve.' You get the idea--upper case numbers, letters, and symbols that are seemingly meaningless to everyone but you. Microsoft has an excellent primer on passwords and a password strength checker."
Check out this link to Microsoft for their password strength checker.