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Here is the white paper and the slides to Mark Dowd & Alexander Sotirov Talk "How to Impress Girls with Browser Memory Protection Bypasses" - a must read :

Especially the whitepaper has some interesting details.

Whitepaper :
http://taossa.com/archive/bh08sotirovdowd.pdf

Slides :
http://taossa.com/archive/bh08sotirovdowdslides.pdf