It is a bit funny -- but makes sense -- that on some Nokia-related sites PC connectivity is taken in its original sense as "Personal Computer" as opposed to mobile phones, so for example http://pc-connectivity.garage.maemo.org/ says "The host PCs supported are Linux, Mac OS Leopard and Windows XP/Vista (Windows 7 under testing)"

So for that project, you can try some mac .dmgs here:
https://garage.maemo.org/frs/?group_id=801
http://pc-connectivity.garage.maemo....ion/index.html
http://maemo.org/development/documen..._connectivity/

Perhaps some initiatives will sprung up on Mac OS too, similarly to linux here http://www.hallysonluiz.com/maemo/