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I use a passphrase, which has higher entropy than a short password and is easier to remember at the same time.
Take a dictionary of 50k words and choose a sequence of 6 words at random. (Use software for this; opening a printed dictionary "at random" won't produce really random results). This provides log2(50000^6) = 94 bits of entropy. This is a similar amount to choosing 15 characters from an 80-character set (lowercase and uppercase letters, numbers, and 18 other characters) which would produce log2(80^15) = 95 bits.
It's much easier to remember 6 random words than 15 random characters. You can generate some passphrases here to estimate how difficult they might be to remember. (Of course you wouldn't generate your real passphrase using an online tool :-)
If you often need to generate XKCD-compliant passwords on Linux machines, you may find this command line handy:
(It will work on a Mac if you install coreutils and change shuf to gshuf.)