Begun to solve a problem that I have been mulling on for almost a year (merging topics). This has triggered some redesign.
SS has not delivered yet. It is partly my fault because my attention has been upon design rather than development.
I have stopped using HTML mockups to model the application layout but I am continuing to use them to experiment with style:
Now I model the layout in a wiki document. Wiki documents on a server can be accessed from any computer and, since wiki software records all document versions, I can edit the documents without accidentally losing valuable ideas.