Layout Algorithms
Graph or network "layout" refers to how a network is visualized. To put it mildly, it is a big deal.
http://en.wikipedia.org/wiki/Force-based_algorithms_(graph_drawing)
http://en.wikipedia.org/wiki/Graph_drawing
Nice diagrams in this software wiki (yFiles Developers Guide
Isabel F. Cruz and Roberto Tamassia Graph Drawing Tutorial
JFLAP Some nice pictures of alternatives.
BoĊĦtjan Pajntar OVERVIEW OF ALGORITHMS FOR GRAPH DRAWING Short description of major types
Somewhat technical description at Mathematica
SCRIBD Document