Did you know there is no entry for gullible in the dictionary? Really! You can check and everything!
If you needed to check, you may not get a perfect score on the McAfee phishing quiz that Roy pointed to. I managed to get 10 out of 10 - and some of them are pretty hard. Try it yourself.
I hate spam, phish mails etc. The other day I got a Nigerian-style letter from Spain. And when I say letter, I mean on paper, in an envelope. Came with cool stamps on it, which I kept. The letter, I tossed.