There is an interesting product around, Site Advisor. I read how it was developed, why, and how it works. Good reading, in my opinion.
It also inclues a test. I got 4/8 wrong
Most people fail the test.
BTW, Bleeping Computer comes out 100% clean, as expected, in spite of all the cookies we get fed from photobuckets and other such. And several people wrote nice comments about BC there. Oh, they do keep opinions and officially built information separate, so it's not blogs or anything like that. Serious product designed by professors.
I read in Office Watch that McAffee is buying it. But we can still get a free download here: http://www.siteadvisor.com/