GDAL internal restructuring broke QGIS - specifically the Postgres support. New QGIS 0.8 preview 2 fixes that.
For GDAL itself, I patched the PGEO driver so it would work without the MDB Tools Access ODBC driver. It should now work with Actual's Access driver again.
I also restored the GDAL documentation (dropped during the restructuring). In addition, the GDAL help is now conveniently available from the Mac OS X Help Viewer!