Some readers beef that our Big Mac index does not cut the mustard.

ECONOMIST: Big MacCurrencies | The

And try as it might, "Marley and Me" just doesn't quite cut the mustard when it comes to answering those big existential traumas.

CNN: Zombies give life to our economic blues

Having unqualified programme contributors state that "they can't ever remember it being so bad" just doesn't cut the mustard if you're looking for a scientific base for your conclusions.

BBC: News Online

Well, that might have something to do with the fact that he's Dvorak, but we did consult a trusted and well connected source who, as it turns out, has heard the very same thing from multiple iPhone users, and who further noted that an accessory keyboard to go with the device may become necessary if the touchscreen keyboard doesn't cut the mustard.

ENGADGET: Will the iPhone be undone by its keyboard?