I am not exactly sure who maintains the Bitcoin Wiki (en.bitcoin.it/wiki), but it is having some server issues. The following errors (or similiar) show up on each page:
Warning: Unknown: open(/www/b/bi/bitcoin.it/sessions/sess_c7bb043e3ae5c9c1cb1406dbe1b9d694, O_RDWR) failed: Read-only file system (30) in Unknown on line 0
Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/www/b/bi/bitcoin.it/sessions) in Unknown on line 0
Also, it appears to be operating in readonly mode (which makes sense).