I'm developing a system using primarily these indicators. I've got some pretty darn good results so far in back testing in AmiBroker but as these systems will necessarily result in a Mean Reversion style of trading I'm looking for some good ways to stay out of the way of trend days.
The theory behind the bollinger bands is that the market will not stry to far outside the 2nd standard deviation. However as we all know, on days like today you can see that this indicator will get you killed.