...
The example here is of a Funds Expenditures Dashboard, with some style tips. Shows how you can put multiple reports together on a dashboard, filter one report using another report. Also shows how to filter a column using formulas.
Analytics Training, from Orbis Cascade Alliance
Provides links to tutorials created by Orbis Cascade members, mostly introductory.
Alma Analytics Internal Training, University of Western Australia (PPT on Slideshare)
...
These are PowerPoints and Word documents on a variety of topics. They are written in more of a how-to format than the official documentation above, and tend to be about specific actions.
This is a single page with screenshots, with instructions on intermediate-level tasks such as adding subtotals to a report, adding a mathematical formula, using filters, limiting a report by dates.