I can't believe that these types of scam messages are still circulating and making it through my Google Mail spam filters - but they are dangerous if you fall for them. They typically come from people you know and share the same hallmarks - see the example I received from a trusted Kabissa member below.
The You can learn more about Internet Fraud at Wikipedia. You can make sure you know how to fight Phishing by taking the PayPal Fight Fishing Challenge, or About.com has multiple phishing explanation pages.
How are you and your family and your health. I'm sorry I didn't inform you about my traveling to Nigeria, I'm in a dire Situation here. I'm so confused right now something very terrible is happening to me now, I had a trip here in Nigeria for a Seminar. Unfortunately for me all my money got stolen on my way to the hotel where i lodged along with my bag where my passport was I don't know what to do or where to go and my Phone is also stolen, I'm in a great sorrow written you this email. I'm even owing the hotel here. The total sum of money that i would need would be $2,900 to sort-out my hotel bills so i can make arrangements and return back, I'm full of panic now, I've sent an email to the embassy here but they are not responding to the matter effectively, I need a favor from you urgently. I'll return the money back to you as soon as i get home, I'm so confused right now. I wasn't injured because I complied immediately. I'll be waiting to hear from you so I can send you the western union information to use in sending the money.God Bless you,