Graphical App for network usage monitoring

there are a lot of different tools to monitor and visualize data like this.

Very common are tools like mrtg (website) or munin (website).

These packages use snmp to collect the data. Another one would be Zenoss or Nagios, but these two packages are much more high level and are used to control lots of servers, infrastructure, possibly every kind of device you're able to write some script for to collect its status. These packages can alert you, if your webserver has just a few megabye of free diskspace left and tasks like these..

regards, Comradin

Was it the NetBoy suite? They had a couple of tools in that suite that would do something like you're describing. I don't think the tools are maintained or sold any more though.