What helmet is everyone riding with? Road, BMX-Skateboard, none?

I use a BMX style shell helmet. I feel more secure with the lower back and sides since you never know how you will land if hit by a car. I crashed on a metal grating bridge once and hit the side of my head, not sure if a typical road helmet would have covered that low down.

Only one problem, heat! Great for the winter but it is too damn hot in the summer. Anyone know of a BMX shell type helmet with more vents than a typical model?