nWire enabled me (in real-time) to look at variable related context (reading, changing, inheritance, other files..) in a way I couldn’t imagine before. This is really nice if you got 100K+ lines of code without knowing much about it, but must to do something with it. In just few hours one can get understanding of the code relation and with help of other tools (xdebugger & kcachegrind) getting to know your code is just more fun than before.
Event better, see you code!
Visualizer helps you visualize code relations in context of classes, inheritance, includes/requires with nicely looking graphs.