I learned a little Mac trick a few weeks ago and find that it has saved me, oh, probably close to a full minute. More important, it keeps me from the annoyance of fiddling with Finder unnecessarily.
Let’s say you’ve just finished working on a slide deck in Keynote — but the beauty of this little trick is that it works with every Mac app — and now you want to email it as an attachment. Open up your email client and simply drag the little tiny document icon at the top center of the window.
Drop it into your email client and (assuming it handles the ol’ dragondrop) it’s attached. No stinking Finder required! Use it whenever you want to drag your current file somewhere.