Yes, tried the prism54 module for hours before I gave up. It would not bring up the interface at all.
When I tried ndiswrapper it worked straight away, I then saw wlan0 in ifconfig, iwconfig, wicd, etc.
As stated in my first post, I can hook into the wireless network if I set a static address but DHCP fails.
Sorry if I was not clear - the problem is not bringing up the interface but getting a DHCP IP address.