Following some post on the web, I was interested in munin. After some fights with perl, and almost giving up! Got it somehow working on my home server. Which recently was as well relieved from routing packets 
thanks to my new Linksys WRT54g.
Munin is prety good tool for graphs. It is using RRD Tool to its plotting. It has system of plug-ins which turned to be extremely easy, when I was debugging some of the graphs not showing any data. It works nice with local resources, as well as with SNMP ( I have to add this part to pull date from my border router ). Did I mentioned, plug-ins are really easy to write!
