[ChrisMorrisCo]

I like the idea of moving them slightly off the screen to show that your window is clearly off the screen... but it might be better to indent the buttons further into the screen so that the close button is still the same size.

[wlesieutre]

I wouldn't be too worried about the size, unless you're speaking from a purely aesthetic perspective. For usability, being on the edge of the screen makes it an easy mouse target.

[ChrisMorrisCo]

Fair point... I suppose I prefer a uniform hit area size on the buttons throughout the UI. I probably have a bit of OCD :P.