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The lambda stuff is in g++ 4.5, which is a stable release, right? It's not really experimental.

Lambdas are also supported in MSVC++ 2010.

http://gcc.gnu.org/gcc-4.5/cxx0x_status.html : "Status of Experimental C++0x Support in GCC 4.5"

Last month's release of 4.5.0 is stable, but the C++0x support is experimental.