These services (IFR and the like) may or may not have continuing value, but beyond them there is another source of market depth. However datafeeds that cater to institutions and require 1M accounts are not relevant to most forum visitors. I suppose ...

(binned per thread starter's request) Behind Price-Orderflow

If experience shows you that using NY's open gives better results, then there it is. But I look for breakouts based on the London Open. Moneyhackers tracks the hourly volatility and the greatest increase in range is at London's open. That's also how ...

ACD Method by Mark Fisher