Made huge progress with the usability aspects of the wizard today. These are the details:

• The wizard data structures can now read and write themselves from the search component of a page URL, meaning that a query setup can be loaded via a URL. This makes it much easier to test changes; you no longer actually have to work through the wizard in order to get some functional data.
• The URL for any query you create is provided to you as a link in the fourth phase of the wizard (review/generate tables), so that you can easily bookmark it and return to run the same query again later.
• Step-back functionality now also works for URL-loaded data, so you can load a previous query and then step back through it to make changes.
• The D-table (query results) layout/display is much improved. There's room for more work there, but it's already much more easily read due to more thoughtful font/colour choices.
• The display of user-constructed ethnicity groupings and city tract sets has been enhanced, so they're distinct from each other.
• The overall wizard page structure has been rebuilt on the model of the rest of the site, so that it blends in.
• There are now links between the (beta site) home page and the wizard page.