I spent a few hours Saturday playing around with Cacti. It's a front end to RRDTool, which I already use to generate charts. It was easy to get up & running as I'm already using PHP, MySQL and Apache on my server. After only a few hours adding devices and setting up graphs, I decided it wasn't for me. I'm already very comfortable writing my own Perl scripts and using Net-SNMP to extract the statistics and build the graphs I want. Cacti adds a couple layers on top of that, and to me, the interface takes too many clicks to get what I want. Plus, I don't plan on using it to graph my 1Wire temps or SpeedFan stats - it'd just be yet another interface to go through.