Routing Traffic on Ubuntu to give Raspberry PI Internet Access

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http://serverfault.com – I'm hoping someone can point me in the right direction for setting up my Linux (Ubuntu 12.04) box to route traffic from eth0 to wlan0. I'll try and explain the problem I am trying to solve: I currently have two separate networks: [RaspberryPi/eth0] / ^ | v [Ubuntu/eth0] / And: [Ubuntu/wlan0] / ^ | v [ADSL router] / So currently if I want to access the RaspberryPI I can SSH from the Ubuntu box to the PI. And if I want to use the Internet, I have full access fr (HowTos)