See also, ITD Open Forum presentation on "Security Challenges"
One definitive weekly summary of new alerts and countermeasures with announcements from: SANS, CERT, the Global Incident Analysis Center, the National Infrastructure Protection Center, the Department of Defense, Security Portal, Ntbugtraq, Sun, and several other vendors. When you subscribe, by selecting only the operating systems you support, you will receive a version of Security Alert Consensus tailored and customized to your needs.http://server2.sans.org/sansnews
Look under Resources, Free Tools
Vision and Fport are useful tools when trying to find rogue processes.
Several useful utilities including Autoruns, Filemon, Regmon, PsTools