I went and had a look... the ISAPI module is based on aolserver 3.0 but all the win32 stuff is in its own directory so it shouldn't be hard to update should the urge strike someone. It includes a Visual C++ project file and nscp, nscgi, nslog, nsperm, and nssock modules.
Besides the caveat in the readme about logs not rolling, it's not clear to me how you'd hook a postgres (or oracle, for that matter) driver into this. Reading the asj article didn't help much here.
