Sites like Web of Trust can also be consulted, although the results are not always accurate. It's also possible for a legitimate site to be cracked and edited or added to. If this was done recently, reviews of the website may not reflect the newly-compromised status of the site.
Although any website that relies upon user ratings cannot be completely relied upon, from experience I consider Web of Trust to be a useful tool if used in conjunction with other resources. Leo's article is definitely worth reading. If only more people were aware of what he wrote, the effectiveness of spam and phishing emails could be hindered.
Edited by Kefes, 09 January 2011 - 07:14 PM.