As of January 2008, Ruud has moved on to other interests, although he is apparently alive and well. As a result, no new puzzles are being generated for posting on the main site (although the daily One-Trick Ponies, X-Files, and Jigsaws repositories have not yet been exhausted). In addition, no new user accounts have been approved since January, nor can they be without Ruud's intervention, which doesn't appear to be forthcoming.
Most of the regular users have moved to a new set of forums established and graciously hosted by Richard Broughton, author of SudokuSolver. They can be found at: