This
Cnet blog post by Robert Vamosi is about
rootkit removal devices. If you suspect your system to contain any
rootkits, just take a gander at all the free software listed in the article. Personally, I have tried
Blacklight before and I found it to be easy and a fast
rootkit detector. I must say that I did not detect any
rootkit on my system, but if you are someone who happened to have bought a
sony audio
cd in the last couple of years, you might need these apps.