Apropos of nothing, except that it has been grating on me even more than usual lately, I wish to register my irritation with what has become an all too common expression.
I really have had it with this: no one ever describes him- or herself as working anymore. It is always working hard.
It's reached the point where adding the modifier diminishes the verb. We are not fairly amused.
Either stop doing that, or if we're to surrender to the inevitable, that the cliché has become an idiom, let's just be honest with ourselves that we've cheapened yet another phrase and eliminate the space: We have been workinghard on our latest project.
[Added] Also: working closely with. Ugh. Prefer working with.