Ad-Hod Wifi Setup successfully done on Jan 26th 2012.
Set-up Ad-Hoc wifi:
http://wiki.gumstix.org/index.php?title=Overo_Wifi
http://wiki.gumstix.org/index.php?title=Creating_an_Ad-hoc_Wireless_Network
Alternate Troubleshooting Links
http://fastr.github.com/articles/marvell-wifi-on-gumstix-overo-fire.html
http://gumstix.8.n6.nabble.com/Ad-hoc-wifi-on-verdex-td637131.html
http://docwiki.gumstix.org/WPA_for_wifistix
http://www.acroname.com/robotics/info/gumstix/networking.html#e15
Driver hacking may be required to get it to use WPA security in ad-hoc mode:
http://permalink.gmane.org/gmane.linux.distributions.gumstix.general/28472
http://gumstix.8.n6.nabble.com/wpa-supplicant-ad-hoc-mode-1-td595893.html
Work Around: Use a wifi router to set-up a managed WPA2 secured network for now.