Once mod_nsd 1.3 will be released, the 1.x version will be pretty much in maintenance mode. All new development effort was going to go to version 2.0 (for Apache 2.0), but there might be a better alternative.
Instead of building an Apache ns_* API compatibility layer, I will work on adding FastCGI support to AOLserver. A FastCGI-enabled AOLserver (or OpenNSD) process will behave *exactly* like a "normal" one (since it's the same source code), but will run a FastCGI listener instead of the HTTP one. This means that one can run applications written for the AOLserver API using any web server that supports FastCGI (like Apache, Zeus, IIS and iPlanet).