So what is in the document? There is a lot of information and I would recommend reading it very carefully. The main highlights are:
- Design and organisation of workbooks and worksheets
 - Configuring Discoverer OLAP
 - Managing the Discoverer catalog
 - Setting up the analytic workspace
 - Tuning tips
 
For now you can download the document from OTN via this link:
http://www.oracle.com/technology/products/discoverer/pdf/discoverer_plus_olap_best_practices.pdf