Banish is a new app for iPhone and iPad that removes that annoying 'Open in App' banner you see all of the time in Safari. Full story from the iMore Blog...
The "Open in App" option in Safari never bothered me. I use it occasionally, mostly for YouTube it seems. What I don't like is the drop down message, telling me what I did from Safari. I do find that very annoying. It gets in my way.