World of Spectrum down
Yes, but only temporarily.
Martijn has informed me the server died less than a week ago (perhaps on Friday the 13th?).
Don’t dispair though. World of Spectrum has been around for 20 years, and a simple server-death won’t be the end of this magnificent project. Work is under way to revive the site in a couple of days.
UPDATE March 18th: The site is partially up again, although the files aren’t accessible yet via their file archive.
UPDATE March 20th: http://www.worldofspectrum.org/ is 100% up again, including their file archive! 😎