Spring is just around the corner, which means the countdown to Summer has begun. For sun care marketers, the all-important Summer season gets in full swing in late May. Yet, despite industry efforts to warn about the dangers of too much sun, just one American household in five (20.0%) uses sunscreens or sun blocks to help guard against cancer, according to Nielsen Homescan Consumer Facts data for the 52 weeks ended June 27, 2009. Another 3.2% use lotions or oils; merely 0.5% use sunburn aids...