This is my Privoxy configuration. It blocks common trackers and ads.
NOTE: My configuration blocks Facebook. If you don't want this, comment out the following line in /usr/local/etc/privoxy/config:
actionsfile block-facebook.action
Installing on Mac OS X
======================
# Install Privoxy through Homebrew
brew install privoxy
# Move the original Privoxy configuration out of the way.
mv /usr/local/etc/privoxy/ /usr/local/etc/orig.privoxy
# Clone the new Privoxy configuration into /usr/local/etc/privoxy
git clone git://github.com/fdb/privoxy-config.git /usr/local/etc/privoxy
# Copy the launch agent script to the global launch agents.
sudo cp /usr/local/etc/privoxy/launch-agent/org.privoxy.privoxy.plist /Library/LaunchAgents/
# Change the user permissions to root (Otherwise the script will not load)
sudo chown root:wheel /Library/LaunchAgents/org.privoxy.privoxy.plist
# Load and start the script now.
launchctl load /Library/LaunchAgents/org.privoxy.privoxy.plist
launchctl start org.privoxy.privoxy