Not that familiar with PIX. I added a route statement to send traffic for remote locations to the VPN box on the same subnet as the PIX:
route inside 172.16.0.0 255.255.0.0 192.168.1.17 1
I can ping 172.16.x.x addresses from the PIX box, but not from hosts with the PIX as the default gateway. Did I miss something else?