Thank you for all the feedback. The majority (86%) seems to use C++11 already or soon, I didn't expect so much interest
Currently I am reflecting about using C++11 in Thor. For the users, this wouldn't change much (they could write std instead of std::tr1). However, internally, many simplifications or even optimizations become possible. The price to pay is a recent compiler like g++ 4.6 or MSVC++ 2010 (which has existed for 2 years already).
What do you think?