I know, shameless plug; but I believe this fits the topic and will be very useful to newbies, too.

[Blacklist] of unreliable, 'taint proclaiming' Bitcoin services / exchanges

The exchanges listed in this topic are especially untrustworthy by being proven to confiscate your coins if they believe you got it from gambling or other activites they don't like (directly or indirectly).
I can't imagine how it must feel to try depositing a large sum of money that you got by selling goods legally, on an exchange, just to find out they confiscated it because some of the people you did business with, might have got their coins through supposed 'illicit activities'.