As 450,000 passwords exposed, Yahoo fails security 101 -- If it wasn't clear before, it certainly is now: Your username and password are almost impossible to keep safe.
Nearly 443,000 e-mail addresses and passwords for a Yahoo site were exposed late Wednesday. The impact stretched beyond Yahoo because the site allowed users to log in with credentials from other sites -- which meant that user names and passwords for Yahoo (YHOO, Fortune 500), Google's (GOOG, Fortune 500) Gmail, Microsoft's (MSFT, Fortune 500) Hotmail, AOL (AOL) and many other e-mail hosts were among those posted publicly on a hacker forum.

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