Didier Rous (Bonjour) on his welded aluminium Time TT frame with a Spinergy Rev-X front wheel and a Time carbon fork. His aero' helmet has no chin strap; it's held on with an adjustable band, like a welding helmet.
Jan Ullrich uses a Limar aero' helmet. It seems to be as aerodynamic as any out there, but offers little protection. It's made of plastic that is probably no thicker than a common two-liter pop bottle.