Plenty according to Mike Bloom, Chief Technical Officer for Gomi Media in Toronto. The current path of learning I see around me is to learn what you have to to cover your ass, go home and watch Jerry. Microsoft has capitalized on this at the cost of production value which translates down to security. None of this is lost on Microsoft. But then again, they don't care.
Security is way down on their list of priorities.
But regardless of which side of the firewall you sit on, you can't afford not to have a copy of Back Orifice. BO has an integrated HTTP server, allowing uploads and downloads of files to and from a machine on any port using any http client. BO has an integrated packet sniffer, allowing easy monitoring of network traffic. BO has an integrated keyboard monitor, allowing the easy logging of keystrokes to a log file. BO allows connection redirection, allowing connections to be bounced off a machine to any other machine on the Internet.