https://bitcointalk.org/index.php?topic=211858.0I would suggest reading up on the trust system. The above link goes to the announcement topic from the Meta section.
I'm going to leave this thread unlocked for newbies to ask questions and help each other understand. Useless replies and off-topic remarks will be deleted.
Edit - This is a useless reply:
+1 for trust
Web of trusts hardly work in the long run. Look at SSL certificates and Ebay seller ratings.