DevX has a special report on C++0x, which includes an introductory article about concepts:
http://www.devx.com/SpecialReports/Article/38864
In other concepts news: work on getting concepts into the C++0x standard is still ongoing. With more than 400 pages of specification currently under consideration as part of the concepts proposal, the volume of changes has slowed progress. However, I’m hoping for success at the upcoming C++ committee meeting in San Francisco this September.
