There are extensive syslog-ng configuration discussions in the syslog-ng help forum.
Note: most of the examples below are out of date.

• http://linux.cudeso.be/linuxdoc/syslog-ng.php
• http://www.syslog.org/syslog-ng/expanded-syslog-ng.conf
• http://www.softpanorama.org/Logs/Syslog_ng/configuration_examples.shtml
• Syslog-ng Filter Functions with Examples
• http://xtermin.us/code/syslogng/
• http://wiki.egee-see.org/index.php/SyslogNG