Noah Kagan has a good post on "Craigslist Fraud, the New ebay" — worth a read.   

snip:

Now I see more emails that remind me of eBay
where they ask you to ship to international countries (which I got
scammed on once) and want to pay excessive of your asking price.

fraud is becoming more important as more person-to-person transactions are going off eBay and going to places like Craigslist and Edgeio. 

i’m working on something now to tackle this problem … more on that in a few weeks….