The "request for help" type of e-mail fraud takes this form. An e-mail is sent requesting help in some way, but including a reward for this help as a "hook," such as a large amount of money, a treasure, or some artifact of supposedly great value
The modern e-mail version of this scam, known variously as the "Nigerian scam", "Nigerian All-Stars," etc., because it is typically based in Nigeria, is an advance fee fraud. The lottery scam is a contemporary twist on this scam.
Responding to these emails cost someone money and loss of their identity, You can see stories of victims at http://www.google.com/news/search?aq=f&pz=1&cf=all&ned=us&hl=en&q=nigerian+scam.
Examples can be found at fraudgallery.com or you can view the thumbnails below for some basic examples.