For certain editorials, such as those of Thomas Friedman and Paul Krugman, one has to purchase an on-line subscription "Times Select". Otherwise, the articles, which appear in the NY Times newspaper are free for one week.

As for Krugman's column - Class War Politics - one can see a brief statment, but to read his column, one has to subscribe to TimesSelect. IIRC the subscription is about $50/annum, and one can download 100 articles/month free.