I've gotta agree with the other responses here: a SPOG isn't really feasible beyond a very limited network. Every group has a different definition of what is interesting and should be immediately visible.
I have been at a customer that did actually implement a single display that had the information needed for multiple groups to monitor a power distribution grid. That single single view required the space of 2 stories and 2 sides of the building and I have no idea how many hosts, video cards, and projectors to generate the display.
What do I look at? The NPM list of nodes (organized by location) and Last XX events, combined with reports that provide status of power supplies and linecards. Management of the devices is done via CLI (typically putty).