Okay... variable balve timing in it's different implementations. LOTS of cars have "VTEC".
BMW VANOS - Varies intake and exhaust timing by moving the fulcrum of the camshaft
Ford Variable Cam Timing - Varies valve timing by rotating the camshaft
GM DCVCP (Double Continuous Variable Cam Phasing) - Varies timing with hydraulic vane type phaser (see also Ecotec LE5).
Honda VTEC - Varies intake, duration, and lift by using two different sets of cam lobes
Honda i-VTEC - Adds cam phasing (timing) to traditional VTEC
Hyundai/Kia CVTT
Mazda S-VT - Varies timing by rotating the camshaft
Mitsubishi MIVEC - Varies valve lift
Nissan N-VCT - Varies the rotation of the cam(s) only, does not alter lift or duration of the valves.
Nissan VVL - Varies intake, duration, and lift by using two different sets of cam lobes
Porsche VarioCam - Varies intake timing by adjusting tension of a cam chain
Porsche VarioCam Plus - Varies intake timing by adjusting tension of a cam chain as well as valve lift by different cam profiles
Rover VVC - Varies timing with an eccentric disc
Suzuki VVT
Subaru AVCS - Varies timing (phase) with hydraulic pressure
Toyota VVT-i - Varies intake timing by advancing the cam chain
Toyota VVTL-i - Varies timing by advancing the cam chain and switching between two sets of cam lobes