Snort monitoring & trend analysis

I am looking at monitoring & trend analysis on the snort boxen. Thought I would take an informal poll as to what monitoring you folks are looking at (CPU load, memory, ETH throughput, number of alarms/minute, etc) and what are you using to formulate your trend (MRTG, Nagios with RRDtool, etc).


Any & all thoughts are appreciated - thanks!

x-posted