10.5.8 - This is what it changed to.

gistfile1.txt

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<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
        <key>EnvironmentVariables</key>
        <dict>
                <key>PATH</key>
                <string>/sbin:/usr/sbin:/bin:/usr/bin</string>
                <key>RUBYLIB</key>
                <string>/usr/lib/ruby/site_ruby/1.8/</string>
        </dict>
        <key>Label</key>
        <string>org.kentoncityschools.puppetconfig</string>
        <key>OnDemand</key>
        <true/>
        <key>ProgramArguments</key>
        <array>
                <string>/usr/bin/puppetd.rb</string>
        </array>
        <key>RunAtLoad</key>
        <false/>
        <key>StartInterval</key>
        <integer>1800</integer>
</dict>
</plist>