Here's a fairly simple way to keep a list of your passwords and still keep them safe.
First, think of some simple things that you would always remember, some of them words, some numbers. DON'T use obvious things like your own phone number, birthday, SSN, address, or things like that.
A simple example:
Your first dog was named Rover
Your best friend's birthday is 4-7-82
Your first little boyfriend was named Jimmy
Your favorite writer is Rawlings
Your number was 13 when you played volleyball in HS
You scored 2146 on the SAT (hey, you're a bright girl! ;-)
Your grandfather's name was Pete
You can make little mnemonics or memory joggers out of them: Dog1, BFF BD, BF1, Author, Jersey No., SAT, Grandpa.
Now you can put these together in all sorts of ways, and then write them down:
Absolute Write, Password: Grandpa+SAT
Absolute Wrong, Password: Dog1+Jersey No.
Bank, Password: BF1+Jersey No.+SAT
Amazon, Password: Dog1+BFF BD+Grandpa
You can make dozens of combinations.
You will know what these mnemonics mean, but no one else will. For the most secure passwords, you can think of things ONLY YOU would know. You want to make so that even if you lost your list, and your best friend found it and even knew the system, they still wouldn't be able to break the code very easily. This way you can even make multiple lists of your passwords; maybe keep one with you, hide the other in your desk.