After reading a handful of blog posts I finally got this working in 10.6...
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Add this to ~/.bash_profile:
export CLICOLOR=1
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Install SIMBL.
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Download this SIMBL plugin and unzip to
~/Library/Application Support/SIMBL/Plugins
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Open up Terminal, there should now be a "More" button on the “Text” tab of Terminal preferences.
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Download this Terminal theme. It's from here, but ignore those instructions.
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Unzip it and double click
IR_Black.terminal
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It should open Terminal prefs. Click "Default" to make the theme the default!
You can also install another SIMBL plugin called Megazoom to add fullscreen support to Terminal (and any other OS X app).