GNU/Linux free software tools to preserve your online privacy, anonymity and security (FSM)

I believe he was referring to the ability of the exit node to view the traffic being sent.
This is unavoidable, given the fact the the traffic must be sent to a destination outside the
tor network.

However, this isn't a "vulnerability" or "security risk" per se. Tor is intended to
*anonomize*, not to secure traffic on an insecure protocol. Tor should be used when you don't
want the target server to know which IP you're using, or if you don't want routers along the
way to know with whom you're communicating. It does *not* provide end-to-end encryption. If
you need that, use a secure protocol such as HTTPS, SSH, etc, or simply tunnel your protocol
over SSL/SSH/VPN/whatever.

If you need end-to-end message integrity, protection against eavesdropping, and anonymity (a
whistle-blower would fit this definition, for example), the use of a secure protocol over tor
works just fine.