I like to have all my logs in one place, so I was using syslogd's network listening on my 10.6 Server to let my router send its logs to it. After updating to 10.7 the plist was reverted to its default state, preventing what I was used to. This hint explains what to do, to get it working again.
First make a backup of the plist, then do the following:
Convert it to XML so it's editable:
sudo plutil -convert xml1 /System/Library/LaunchDaemons/com.apple.syslogd.plist
Edit the file; I used pico with this command (you can also use TextWrangler, etc.):
sudo pico /System/Library/LaunchDaemons/com.apple.syslogd.plist
You need to insert this key:
<key>NetworkListener</key> <dict> <key>SockServiceName</key> <string>syslog</string> <key>SockType</key> <string>dgram</string> </dict>
Mac OS X Hints
http://hints.macworld.com/article.php?story=20110724103552640