Looking for a good host file, but not ads

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A lot of host redirect files are out there, but most of them are 90% ad
servers, and many of them on legitimate sites.  What I'm looking for is a
host file of malware or ad serving companies who serve the nefarious crowd.

For example, I don't really care about filtering out the ads served by (for
instance) CNN.com, but I would like to block ads and cookies served by anyone
who does business with wallpapers4u.com (don't go there without shields up).

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