A new white paper for the Oracle Optimizer is now available. Just go to the Query Optimization page in OTN.
I've reduced the number of scripts in the text of the papers to keep them down to 20-30 pages, otherise it's too easy to hit 40+. As an alternative, I upload examples to GitHub.
Post comments to this blog if you want to give me feedback on the white paper's content. If you want more examples, let me know and I'll add suggestions to my to-do list. Of course, I intend to post more entries here (and scripts to GitHub) to cover things in more detail anyway.