If you're interested in knowing more about how the sun affects your skin, what SPF really means and why skin cancer rates are going up, we'd recommend listening to a half hour podcast at NPR where they talk with Dr. Rigel, a leading dermatologist who's written the leading textbook Cancer of the Skin

At one point in the talk he says he calls tanning beds 'coffin beds' as they really do lead to skin cancer.

See also Tanning Beds Cause Cancer.