However, disabling this is not simple. There is nothing in the BIOS to disable the card and in Ubuntu 10 there is no straightforward way of disabling a wireless interface. Several searches and a lot of dead ends later, I came across an article that said that NetworkManager will not manage interfaces that are marked as manual in /etc/networking/interfaces. The basic idea is to mark the unwanted interface as manual and never manual activate it.
So this is what I added to my /etc/network/interfaces and all works. The applet shows the built in card as device not managed and it stays that way after a reboot.
# disable the builtin wireless card
auto wlan0 wlan1
iface wlan0 inet manual
down ifconfig $IFACE down
The other thing I had to do was to stop Ubuntu from bugging me for the WPA password (for which it needs the keyring password) was to follow the steps from ubuntu-tutorials.com. I'm also listing the steps below in case the URL is unavailable later on
sudo aptitude install libpam-keyring (was not needed on Ubuntu 10)
echo "@include common-pamkeyring" | sudo tee -a /etc/pam.d/gdm
requires that your login password and the keyring password be the same.
So now, I can mount my router attached USB share on my zotax box, and all is setup to launch a picasa slideshow making for a nice 21inch touchscreen Picture Frame (Will be best after I get android-x86 onto it but for now it is dog slow and this solution works for me). Will keep checking on the progress of the android-x86 folks though as having android run on a large touch screen will be fantastic.