I have now released another Google Code Project in relation to Sabnzbd. This is a Java API that consumes Sabnzbd server functions. It supports alot of functionality at the moment, querying all information about the server and downloads and also supports other functions such as adding downloads, pausing and resuming the server.
More detail can be found on the Google Code Project here:
http://code.google.com/p/jsabnzbd/