Looking through my own answers, I just found this old question and realized that although all the other answers (including my own) are still relevant, now there is another important site that has been added to the list:
http://isocpp.org/
This is done by the committee itself and regularly updates the status of C ++. And, recursively, also points to a random StackOverflow entry.
They also usually tweet from @isocpp when an article is published or updated, or about other issues in C ++, such as videos from a recent C ++ conference.
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