Do you mean software that filters sysloged files for specific actions, or a decent syslog program that can put logs into different files?
fe, I use syslog-ng which has a very powerful filtering program so that it can put dns requests into dns.log and any dns errors/warnings into debug.log
"I contend that we are both atheists. I just believe in one fewer god than you do. When you understand why you dismiss all the other possible gods, you will understand why I dismiss yours." Stephen Roberts