UI Recipes - Weekly 15 min lessons on UI design from the hottest apps
TrackMania - The most popular online PC racing game.
UI Movement - The best UI design inspiration, daily
TORCS - TORCS, The Open Racing Car Simulator is a highly portable multi platform car racing simulation.
Design Principles - An open source repository of design principles and methods
Real Racing - Experience all of the excitement, competition and glory of championship racing.