I thought this was a good method for creating strong but easy to remember passwords.

What to do	Suggestion	Example
Start with a sentence or two (about 10 words total).	Think of something meaningful to you.	Long and complex passwords are safest. I keep mine secret. (10 words)
Turn your sentences into a row of letters.	Use the first letter of each word.	lacpasikms (10 characters)
Add complexity.	Make only the letters in the first half of the alphabet uppercase.	lACpAsIKMs (10 characters)
Add length with numbers.	Put two numbers that are meaningful to you between the two sentences.	lACpAs56IKMs (12 characters)
Add length with punctuation.	Put a punctuation mark at the beginning.	?lACpAs56IKMs (13 characters)
Add length with symbols.	Put a symbol at the end.	?lACpAs56IKMs” (14 characters)

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via Create strong passwords – microsoft.com

To add complexity with case though, I might use vowels to select uppercase letters instead. Splitting the alphabet in half seems like it would be much trickier to remember, for me at least.

Found via Tech Radar’s 25 internet security tips, which has 24 other excellent suggestions…