By the way, here's the complete list of blocked sites from my
/etc/hosts:
127.0.0.1 adfu.blockstackers.com
127.0.0.1 ad.doubleclick.net
127.0.0.1 m.doubleclick.net
127.0.0.1 ad.webprovider.com
127.0.0.1 image.linkexchange.com
127.0.0.1 jeeves.flycast.com
127.0.0.1 www.flycast.com
127.0.0.1 www.burstmedia.com
127.0.0.1 www.247media.com
127.0.0.1 www.ad-venture.com
127.0.0.1 www.adauction.com
127.0.0.1 www.adsdaq.com
127.0.0.1 a32.g.a.yimg.com
127.0.0.1 www.pagecount.com
127.0.0.1 www1.pagecount.com
127.0.0.1 www2.pagecount.com
127.0.0.1 www3.pagecount.com
127.0.0.1 www4.pagecount.com
127.0.0.1 ad.linkexchange.com.com
127.0.0.1 www.smartclicks.com
127.0.0.1 mojofarm.mediaplex.com
127.0.0.1 www.etour.com
127.0.0.1 netadsrv.iworld.com
If you come across any other "filter-worthy" servers, let me know!