According to McAfee, most users are unable to spot spyware on websites.
"According to the first-ever Spyware Quiz conducted by SiteAdvisor, a staggering 97% of Internet users are just one click away from infecting their PCs with spyware, adware or some other kind of unwanted software. Even though the threat of spyware has received extensive media coverage, just 3% of the 14,000-plus consumers who took SiteAdvisor?s spyware quiz received perfect scores."
You can take the quiz here. From just looking at the screenshots. I think I did alright with 7 out of 8 questions correct. The one I got wrong was the Lyrics site.
via Cow's Blog