Even with the latest ubuntu-backport-modules on intrepid ibex, the wireless card on this Acer isn’t reveled, probably by a badly behavior of the rf kill switch.
The only way i found that do the work is to install the madwifi modules from trunk:
# aptitude install subversion
# svn checkout http://svn.madwifi.org/madwifi/branches/madwifi-hal-0.10.5.6/
# cd madwifi-hal-0.10.5.6/
# make
# make install
# depmod -a
# modprobe ath_pci
# reboot
