Numbers and text on the various different releases that are floating around. Add yours or add your name (or a +1) if you simply verified the details on your copy.
Next step will be getting filelistings of the content.
The goal: Having an overview of the different releases and being able to point newbies to their version and provide specific installation instructions for modern OSs.
http://ogdb.eu/index.php?section=simplesearchresults&searchstring=quake&how=AND looks like a great resource