I installed memcached using mac ports:
http://glassonionblog.wordpress.com/2012/02/18/installing-memcached-on-mac-os-x-snow-leopard/
I am able to start memcache but I cannot figure out how to restart it.
I started it by doing: memcached -d
sudo launchctl unload /opt/local/etc/LaunchDaemons/org.macports.memcached/org.macports.memcached.plist
sudo launchctl load /opt/local/etc/LaunchDaemons/org.macports.memcached/org.macports.memcached.plist