As of February 23, 2003, version 3.4.1 of NetHack is out! Click here to go to a local copy of the official NetHack site. This copy contains most of the links to the current official binaries, sources and documentation for the abovementioned version 3.4.1 of the game. It does not contain any links to official older versions of the game, which you may find on the official NetHack site.
This page directs you to a mirror of the official NetHack site. If you do not wish to use this mirror site, you can go directly to the official site. On the official site, you won't find any spoilers, only the binaries, sources and official documentation. You are kindly requested to use this site, however, to take some of the heat away from the official site.
If you're looking for spoilers, go to the spoilers page on this site, where you may find spoilers for 3.4.1 and older versions of NetHack. There aren't many spoilers for 3.4.1 yet, but I'll add them as they become available. In the mean time, have a look at the spoilers for version 3.4.0 or older versions. The more recent, the greater the chance that they will still be valid, at least for the main part.
Since this copy of the official NetHack site was made in a hurry, to provide a mirror as soon as possible, there might have been a few oversights in copying the original files.
If you notice an error or a dead link, please let me know at the address below.