Do you use the same user names and passwords for all of your websites, accounts, etc...?

I’m constantly creating accounts for something (banks, job searching sites, magazines, cooking sites, credit cards, etc…) and often times, I use a variation of 2 passwords, and 2 user names. I have 2 email addresses – one for everything and one for seriousness.

Do you have different e-mails/user names for different accounts? What about passwords? Is it unsafe to use the same password for most accounts?