That is true, but I've had Ad-Aware SE catch things that Spybot-S&D hasn't. Plus, Ad-Aware doesn't always have those 5 items (can't remember what they are) that you can never get rid of (and probably shouldn't!)

I should point out that I'm talking about SE, not Ad-Aware 6 or earlier.

arstechnica had a good article comparing various spyware removal/scanning programs.

I am the Doctor, and THIS... is my SPOON!