Update: April 30, 2007
How To: Download and Extract the HOSTS fileFrequently Asked Questions
Note: The "text version"
also makes a great resource for determining culprit URLs. Note
: If you use IE-SPYAD, Spybot Search & Destroy, SpywareGuide Blocklist, SpywareBlaster, a hosts file or any combination of those, please check all protections and re-enable as needed whenever any of the aforementioned is updated. More here