Here's an online quiz (via Buzzworthy) which asks you to identify various sample e-mail messages, shown in your web browser, as either legitimate or attempted frauds. (The quiz is perfectly safe to take—it never asks for personal information.)
I managed to get 9 out of 10 right, and the one I got wrong I was suspicious about. I did have to View > Source on several of them to be sure of my hunch. In any case, I wouldn't click on links in any of these e-mails if I received them for real. When personal information and credit card details are involved, I always type the known address of the appropriate service into my browser manually.
Fraudsters are getting more sophisticated, and that's a pain.
On a lighter note, here is an alphabetical listing of sound effects by MAD magazine cartoonist Don Martin, with their context.