My favorite new app is another brainchild of the Environmental Working Group (EWG). Have I mentioned how much I love those guys lately? (Safe Summer Sunscreen posting.) The app has lists of most commerically avaiable sunscreens and rates them from 0-10, 0 being safest and 10 being the most toxic. It is also interactive so when your head is spinning with options standing in the sunscreen aisle at Whole Foods you don't have to pick up each bottle and read the ingredients, you can just type in the name and see its rating. Brilliant.
You can test-drive the EWG Sunscreen Buyer's Guide app here.