what i've been doing for years is this:
i think up a phrase like: "No body will ever break that pass word but me".

then when i have to write the password, i only write the first letter of each word; this is the result:
"nbwebtpwbm".
if a site also wants at least one number in the password, then i just add the number 1 at the end.

no one can ever guess at the phrase i use, much less at the pass itself, and this combination of letters can't be found anywhere.

works good for me.
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See: http://www.blu-ray.com/community/gallery.php?member=Gelli
or: Axiom Gallery