A few items to add to the nodeeditor wiki:

Shift+doubleclick on a node will also open the info panel.
Multiple nodes may be displayed in the info panel by shift+clicking on additional nodes.

There is a rounded rectangle to the left of each node name.
Clicking on the rounded rectangle to the left of the node name, will minimize/maximize the node.
The rounded rectangle is grey for many nodes. If red, the associated js node is likely not installed.
For the output node, the color of the rounded rectangle is an indication of the status of the node.
Like a traffic stoplight, green indicates a favorable setup.
Red indicates a problem. Orange indicates some intermediate state (?)

- Brian