If you can calculate the difference between high and low from eod data and convert that percentage wise, then gradually you can develop a database of the stocks giving high intraday movement (volatility). Perhaps high beta/ high volatility stocks also provide the same. Guess you require this data for intraday trading. But apart from finding high volatility stocks, if you can find a good intraday game with good range, and can execute that accordingly, you can make good profit out of that. Hope this will help you.
Sudip