The BBC just sent this out over the wire:
Top Gear presenter hurt in crash
Top Gear presenter Richard Hammond is in a critical condition in hospital after a crash in a jet-powered car while filming for the programme.
The presenter, 36, was taken by air ambulance to a Leeds hospital which has a special neurological unit.
A North Yorkshire Ambulance Service spokesman said he was unconscious when they got to the scene but was regaining consciousness at the hospital.
A BBC spokesman confirmed the presenter had been injured during a shoot.
Obviously, we extend our best wishes and hopes for a safe recovery to both Richard Hammond, his immediate family and of course to all the people who work on Top Gear. That's all we've got right now, but we'll get you more as soon as we know more. [Hat tip to Stephen]
Top Gear presenter hurt in crash [BBC]
UPDATE: Huzzah! Richard Hammond Now Described In "Stable Condition" After Jet-Car Crash
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Top Gear [internal]