Before the Internet, passwords played only a tiny role in everyday life. Think about it: Except for your ATM PIN, what important codes did you need to remember? Probably none. But now, you can’t click a link without hitting another site that requires a password. Doesn’t matter if it’s a big-name destination like Google Docs or Mint.com, or a smaller, more private site such as your local library or company intranet. You want in? Password, please.