Some wireless troubleshooting tips for OS X:
http://osxdaily.com/2007/01/18/airport-the-little-known-command-line-wireless-utility/
http://osxdaily.com/2009/11/24/option-click-the-airport-menu-for-extra-wireless-info/
http://osxdaily.com/2010/07/07/test-wireless-signal-strength-from-the-command-line/
