This is an interesting paper from Microsoft Research. Now, before you read it: This is research and be no means a commitement to develop it for IE 9.
The Multi-Principal OS Construction of the Gazelle Web Browser
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Roger Halbheer
Roger Halbheer is an Executive Security Advisor at Microsoft in EMEA acting as a trusted advisor to CxO. Before that he was a Managing Director at Accenture's Financial Services. Before joining Accenture, he was the Chief Security Officer of Swisscom (Switzerland's largest telecom provider) and the global Chief Security Advisor for Microsoft.