The web server 'larousse' which holds the English wikipedia (and test.wikipedia.org) is down due to problems with a software upgrade that will require some on-site maintenance.
I've called Jason, he's on his way (thanks Jason!); hopefully this should be sorted out within a few hours.
Sorry for the inconvenience...
All non-English wikipedias, meta, wiktionary etc are unaffected.
-- brion vibber (brion @ pobox.com)