Originally Posted by Talgog
That's really just common computer/life knowledge, though. Don't reuse passwords for anything.
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As "good" as this advice is, most people cannot remember vast numbers of passwords which means they will write them down, which then creates another security risk.
Possibly better advice would be to have a few sets of passwords
low-security set: put these in on whatever random trash on the internet you join that have essentially no penalties to getting hacked and essentially no safeguards on your info.
medium-security set: use these for stuff like WoW where there are some penalties to getting your pw stolen, but not unimaginably harsh ones, and you have some expectation that as long as you're not stupid, no one will get your pw
high-security pw: for stuff like online banking.
Keep 2-3 for each to get through different password security settings (i.e. must be at least this long, cannot be longer than this). Remembering 6-9 passwords is a lot more doable for people than remembering a different one for each thing they join. ^_^