A new UT2004 ladder has been announced, namely UTleague 1on1 ladders.
They are running duel, iDM and ArenaMaster. Each mod has its own server, and every game played on that server will count for the ranking.
The ladders will be updated as soon as possible by the admins of UTleague. To make their life easier try to play your games with the same nickname.

You can ask any question or report problems on #utleague on QuakeNet.

The website of the ladder itself can be found here.

The following servers are available:

Duel: ut2004://46.228.196.239:1337
iDM: ut2004://46.228.196.239:13600
ArenaMaster: ut2004://46.228.196.239:13500