Comment 1 for bug 1178261

Not reproduced with Inkscape 0.48.2 (official package) as well as with local builds (using MacPorts only for the dependencies) of Inkscape 0.48.4 and trunk (GTK+/X11 2.24.13 and GTK+/Quartz 2.24.17) [*] and a Wacom Bamboo Pen&Touch (CTH-470):
Pressure sensitivity e.g. for the calligraphy tool works as expected if the device input is correctly configured to use the tablet pen for input. I cannot test axis data though since not supported with Bamboo.

> (installed via macports)

Do you use the default variants (X11-based) for GTK+ and its dependencies, or the +quartz -x11 (or +no_x11) variants (e.g. via global variant settings in "$PREFIX/etc/macports/variants.conf")?
Reason for above question: Full tablet support with the Quartz-based backend of GTK+ is upstream work-in-progress: GTK+ 2.24 has recently got basic support implemented, but due to limitations of the Wacom driver it is rather unstable if used with command-line apps (as opposed to regular OS X application bundles).

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[*] Note: My local MacPorts trees used for 0.48.x and trunk builds are somewhat dated i.e. not fully up-to-date with MacPorts' current versions of the relevant portfiles.