Woohoo! I have the nsoracle2-6 driver working now with Aolserver 3.5.1 on OS X 10.2.3 against the dev version of Oracle 9i on the same machine. I don't have openacs on this machine yet, so I am modifying the nsoracle test tcl files to not be dependent on openacs, which is as should be, anyway.
BTW, if you had access to a free Oracle license and had a web database with a couple dozen tables and a few GB of data which don't change very often, would you pick Oracle or PG?
-Kevin