My Technical review is now online at Automoto365.com. With the latest updates across the grid.
http://bit.ly/aGG7yC
or
http://f1.automoto365.com/news/controller.php?lang=en&theme=default&team_id=0&month=07&seasonid=21&nextMode=ExclusiveNewsForm&news_id=41314
Scarbsf1's Blog 
“Secret of Red Bull’s qualifying speed revealed?”
http://www.motorsport.com/news/article.asp?ID=376408&FS=F1
I wonder if Renault could copy this as well.
There’s been quite a bit of discussion on this in the EBD thread. I will write a fuller blog post with soem pics to explain the solution before the race this weekend……
https://scarbsf1.wordpress.com/2010/06/25/exhaust-driven-diffusers/#comments
Why Renault specifically? It’s SECU programming, not engine mechanics.
Renault because it is engine tuning, thats under the control of Red Bulls engine supplier Renault Sport. Red Bull wouldn’t tune a basic engine parameter such as ignition timing.