I have no idea if this works as advertised, but those are some impressive looking metrics.

http://munin.ping.uio.no/ping.uio.no/vodka.ping.uio.no.html

Think I'm going to try installing this. I've got homegrown scripts to monitor a lot of this stuff and I've used nagios in the past. But it's pretty cool to see it all laid out like that.

Yeah, it does seem interesting. Also check out RRDTool (if you haven't already) if you're doing roll-your-own stuffs.

I'm also currently setting up/trying out Zenoss. http://www.zenoss.com so far I like it, just need to get used to its way of doing things...

We use Munin on our machines - it's a great tool, highly recommended.