Hi james,
What kind of synching are you talking about? Contacts..etc?
AFAIK, the Motorola Phone Tools is the only official way of synching with the mobile and from Motorola's web address - "Motorola Phone Tools requires Windows® 2000, Millennium, or XP.".
I guess for a Linux box you need to have a virtual machine emulator with windows installed to work. But due to the limitations posed by the VM..it may not be feasible.
Rgds
Sandy