It took a us a while although we now have PCI Express cards /w a low profile
bracket. For the moment they are only available from the US. They should
eventually be available from the UK as well. As is our policy they work great
across free software distributions like Trisquel.
http://libre.thinkpenguin.com/
P.S. We have a new USB Wireless G card that will be available soon to replace
another discontinued card. The chipset is still discontinued although we have
acquired old stock (although new product). In fact we will probably have a
few different USB G Wireless Cards soon with variations of the RTL8187
chipset.
The USB Wireless N chipset is not resolved although I'm expect us to get a
new card for testing this week. If that goes well we will approve the
manufacturing and get a new card that will hopefully hold us over until
Atheros legal approves the release of source code for "cleaning up" on a
newer chipset. My best guess for support in Trisquel is it is at least a year
away. And we don't know for sure this is happening. So... hold your breath.