I have installed all the latest versions of the Sony software:
SxS Device Driver v1045050
XDCAM EX Clip Browser v2.05.01
XDCAM Transfer v2.9.0
On MacBook Pro with Snow Leopard 10.6.1
All working fine with Final Cut Studio 3. The only driver that is not working is for the PDW-U1.
Thanks, Scott K.