If you don't want to go through the hassle of setting up a formal network between two Macs, but still want to transfer files between the two, take a look at Airdrop. Airdrop is a built-in utility found in Mac OS X Lion (10.7) that will allow you to easily drag and drop files to another computer belonging to you or a friend.
If both computers have available Wi-Fi connections and are running at least Lion, take a look at this guide to learn how to setup and use Airdrop.
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