For generating memorable passphrases with high entropy, I like the "diceware" system:

http://world.std.com/~reinhold/diceware.html

Use it to generate the one password that you use for unlocking your password manager, where all of your randomly generated passwords are kept.

Since most people don't do that, this post makes me think that my idle CloudCracker cycles spent mining BTC would actually be better spent mining brainwallets. =)