The On Balance Volume Disparity Indicator was created by Phillip C. Holt (Stocks & Commodities V. 14:6 (265-269)). This converts the classic OBV indicator into Bollinger Bands and calculates the percentage of where the value lies within the Bollinger Bands. Buy when the obvdi rises above its signal line and sell when it falls below the signal line.
This was a special request so let me know what other indicators you would like me to write scripts for!