Jonathan, I recall people commenting how nice it was to have XSLT support in nsxml, in the #openacs IRC channel. If it's not too much inconvenience for you, and Ben gives his approval, I think it's a good idea.
BTW, there doesn't seem to be an aolserver-postgresql RPM on openacs.org. Should we create another SDM project for it, or are you going to bundle the driver with the AOLserver RPM?