Postfix has a bunch of queues, and a bunch of stats through other packages, how about some simple shell things if you have multiple instances running?
Some simple postfix processing things Sunday, March 25, 2007
Perl command line editing files Saturday, March 24, 2007
I can never remember how to do this, I always have to try the 10 versions of perldoc help then resort to google searches… So, documentation in a common place seems like a nice idea.