DecisionPoint Swenlin Trading Oscillator can be used to identify short-term tops and bottoms. This is a breadth indicator. STO is designed to be calculated using either issues or volume, I will post a follow up indicator that makes use of volume.
You can read about the interpretation of the signals (& gotchas) in the link below.
I have added support for NYSE / NASD / AMEX and also a combined mode. You can specify custom advancing/declining mkt symbols too.