Configuring Internet Sharing between an iMac running Snow Leopard, a Mac laptop, an Ubuntu netbook, and a Roku

The title lays out the scenario: we had an iMac running Mac OS X 10.6.2, connected to the internet via a DSL modem. We wanted to create a wifi network so we could get a Mac laptop, an Asus Eee PC 901 running Ubuntu GNU/Linux 9.10 (Ubuntu Netbook Remix, Karmic Koala), and a Roku Netflix player all on the net. Turns out you can use the iMac itself to create a wifi network. No additional equipment is required, just some tricky configuration.
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