just got my new toy connected to my linux box via bluetooth. Can transfer files and mount the sx1's filesystem to the pc.
I also am able to establish a ppp connection between the sx1 and the pc. The sx1 accepts the ip and I can ping it. Unfortunately that's about the only thing I can do with the tcp/ip connection. Opera and putty on the phone both bring up the accesspoint selection when I hit "connect" or try to send data to the internet. So it seems I have to tell the sx1 to use the existing connection and to use the linux box a default gateway.