We develop a 64-bit application for MacOS: OsiriX.
We currently use the Space Navigator in the 32-bit version, but we cannot use it in 64-bit, because the ".framework" library is not available in 64-bit (ppc64 and x86_64). Are you going to release it in 64-bit for Macos Leopard????
A 64bit version of the framework is planned for the next driver upgrade in 1H of 08. If you need support sooner, you may want to consider going through the HID manager and access the device as a multi-axis controller