If you truly are paranoid there is always your host file
Code:
# [Google Inc]
127.0.0.1 adwords.google.com
127.0.0.1 pagead.googlesyndication.com
127.0.0.1 pagead2.googlesyndication.com
127.0.0.1 adservices.google.com
127.0.0.1 imageads.googleadservices.com
127.0.0.1 googleadservices.com
127.0.0.1 www.googleadservices.com
127.0.0.1 apps5.oingo.com
127.0.0.1 service.urchin.com [Urchin Tracking Module]
127.0.0.1 google-analytics.com [urchinTracker]