As far as I can see so far the T42 works with BT3 beta (as did BT2)
This time though my Alpha Networks AWUS036H works out of the box. No more over writing the ieeee80211 ko files. Also there is no last character problem with the essid and as I assumed before that Wireless Assistant didn't work because of this I am pleased to report that it does now.
I will report back when I've checked out my installed atheros mini pci card but as it worked before.... - famous last words