Fernando Alonso wins second F1 title with Renault • Michael Schumacher retires at end of season after narrow defeat in title race • Jenson Button wins first grand prix in Hungary • Famed designer Adrian Newey leaves McLaren and joins Red Bull • Audi takes historic diesel-powered victories in the Sebring 12 Hours and Le Mans 24 Hours • Juan Pablo Montoya walks out of F1 mid-season to start NASCAR career • Lewis Hamilton wins GP2 title and seals McLaren F1 drive for 2007 • Sebastien Loeb wins third straight WRC title despite being in an ostensibly non-works Citroen and missing three rallies with a broken shoulder • The knockout Q1/Q2/Q3 qualifying system is introduced for F1 • F1 switches to V8 engines • Jordan and Minardi names disappear from F1, but BMW returns as a constructor • MotoGP legend Valentino Rossi decides against F1 switch after several Ferrari tests • Jimmie Johnson begins run of four straight NASCAR titles • Sam Hornish Jr wins Indy 500 and IndyCar title for Penske
2006
Fernando Alonso beats Michael Schumacher to win his second title. Schumacher retires at season's end
Juan Pablo Montoya walks away from Formula 1 mid-season to start his NASCAR career
Lewis Hamilton wins the GP2 title and earns a McLaren drive for 2007
Audi claims the first diesel-powered victory in the Le Mans 24 Hours
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