Freaking out about a frizzy hair day? Get the Haircaster iPhone App for 99 cents and style with confidence.
Haircaster uses your location to find out the local weather and then analyzes how the humidity and temperature will affect your 'do. For those extremists, it advises you to stay in if conditions will have you looking Medusa-like.
A little superficial and silly, maybe, but it could save you a little stress on days when you want to look fab and frizzy craziness is unwanted (and when is it?).