The thing I don't like about password managers is that they become just another thing to crack, at which point all the passwords are out. You can sacrifice security for convenience, but rarely can you have both.

Randomly generated passwords are no harder for a computer to guess and far harder for the human to memorize. I use the same long base string for all my passwords, then modify it somehow for each account. I record these modifications in a notebook but not the base, so it's useless to anyone who finds it. For example:

Base password: icantrememberthepasswordto

Nixers password: ic4ntr3m3mb3rthep4ssw0rdt0nix3rs
Nixers notebook entry: l33t nix3rs

Facebook password: icantrememberthepassword4facebook!!ohshit
Facebook notebook entry: -2+4fb!!ohshit

So on and so forth. I have a good memory so after I use the password a few times I don't really need the notebook. Except for things I rarely log into.