First alerted to this via The Religious Policeman, BBC report is here. It is the first attack on Saudi oil installations, a policy long advocated by al-Qa'ida; Friday is of course the weekly holiday in Saudi Arabia. The facility handles roughly two-thirds of the Kingdom's oil exports and production is said, by the country's Oil Minister, Ali al-Nuaimi, to be unaffected.
Is this the beginning of something?
UPDATE: (Saturday 25FEB06 03.40 GMT) Al-Qa'ida claim responsibility for the attempted attack, report Reuters.