The New York Times will stop charging for access to the subscription parts of its Web site, [midnight Tuesday], recognising that subscription fees cannot outweigh the potential ad revenue from increased traffic on a free site.

“In addition to opening the entire site to all readers, The Times will also make available its archives from 1987 to the present without charge, as well as those from 1851 to 1922, which are in the public domain.

More details in this article on the Times website