I had read these posts before:
http://www.conitecserver.com/ubb/ultimatebb.php?ubb=get_topic;f=32;t=000011but I had thought that I would still be able to obtain the linear velocity. The physics object I'm trying to get the information for is a rolling ball. I must be having the same problem as you then James. I wasn't sure if I was interpreting and using the commands correctly.
Thanks,
Jason