I spent most of last week writing. This surprises even me - to sit down and write for long periods was a very strange experience and actually made me feel a bit like a writer (lucky that!).

I got words down for a substantial chunk of the book - not very good words, but words nonetheless. In doing so, I did three things you may be interested in:

1. Found academic publications I had never read before:
   These are now in the bibliography, which I'll continue to build as I go. Many of these are locked in subscription-only journals, which is the perennial problem for practitioners.
2. Thought hard about the focus of the book:
   Many of the existing resources talk about card sorting as an abstract or research-focused technique. These don't tend to answer the majority of questions practitioners face. So I'm focusing on card sorting as a practical technique to be used in the design of information environments (not as a psychological technique). Focusing here really helps me to set a direction and pull a set of practical theories and ideas together. It even feels good to me!
3. Started preparing an analysis spreadsheet:
   I have a spreadsheet I've been using for a while to store the master card set (which mail-merges into Word to create labels), record outcomes for each sort, play with the outcomes and show some clustering statistics (not a 'cluster analysis' diagram, some basic percentages). I have a lot of work to do on it to explain and document it, but will make it available before the book is out.