Again, thinking out loud here – a user here not a developer – just wishful thinking.
Will it be possible (well as the title suggest --What is the most awesome module/feature for NS, hat does not yet exist?) take file server and collaboration a notch higher? I mean, a document management system and perhaps project management? With standard versioning/check-in-check-out feature? Look perhaps LogicalDocs and/or Alfresco.
And after that, a whole bunch of CRM/ERP 
