Detecting WiFi Signal Strength

LifeHacker had a call for help for "WiFi Signal Strength Tool?", so that got me to looking for PC software. NetStumbler and PCTel Roaming Client were mentioned in the LifeHacker call for help, but I needed to know what else was out there. A buddy and I were talking and he pointed me to SecTools.org which has a plethora of network security tools. I am also a fan of GRC's ShieldsUp and Angry IP Scanner to look for vulnerabilities within your own network. I do not condone any of these utilities for hacking!