Comment 10 for bug 819209

> With Python 2.7.1 new in Lion as default python version (…)

Minor correction to my prior argument:
Even if the universal binary of Python 2.7 includes a 32bit version, it would not help with current Inkscape packages on OS X Lion because they do not include the required python modules for python 2.7 (lxml and numpy are included in Inkscape.app for Python 2.3-2.6, in 32bit).

For now, the easiest solution would be to modify the launcher script to run Python 2.6 in 32bit mode on both systems (Snow Leopard, Lion) - of course only if supported by '/usr/bin/python' on Lion.