High-class talks around the clock in the Forum, non-commercial projects presenting their work, new developments at the largest IT fair in the world, CeBIT Open Source 2010 in Hanover, Germany.
Internet intruders have many ingenious ways of escalating privileges and hiding their presence once they get inside your system. The best protection is to keep them out in the cold.
Services that require a username and password for login are potential targets for dictionary attacks. Sshutout and Fail2ban introduce time penalties for invalid attempts.