How not to get taken
There is a nice entry on the official Google blog on how not to get scammed over the internet. You can read it here.
I've noticed I tend to get a lot of phishing emails disguised as communication from eBay. A good rule of thumb for eBay users is to log into eBay and see if there is a message in your inbox on the eBay website. If not, then the email is fake.