[boost] [C++0x][config] Taking advantage of C++0x features as they become available

In another thread, Doug Gregor wrote:

The other issue is that it would be great to test gcc-4.3 in C++0x mode (-std=gnu++0x) as well as C++98 mode. Then we can start taking advantage of some of the 0x features. Yes, and some other compilers are also starting to add C++0x features.

Has there been any discussion as to how Boost.Config is going to report availability or not of C++0x features? That would seem to be the first step in what promises to be a long, winding, but *very* interesting and productive path. --Beman