GeckoBoard - Dashboard as a service - Can be coerced into creating whatever kind of charts/graphs you want on a slick looking board, but is set to do polling of data which is less helpful for system operations stuff, but nicer for marketing, MAU/DAU monitoring, signups, etc.
Stashboard - Open source status monitor for elements of your infrastructure, run it on AppEngine
http://www.stashboard.org/
GeckoBoard - Dashboard as a service - Can be coerced into creating whatever kind of charts/graphs you want on a slick looking board, but is set to do polling of data which is less helpful for system operations stuff, but nicer for marketing, MAU/DAU monitoring, signups, etc.