This is a useful tip that I recently picked up from the Apple Pro site. It often happens that you have a file open in a program such as Photoshop or Word, but don’t know where that file is saved on your hard drive. For example, you may have double-clicked on a file inside your email client and found yourself editing an image in Photoshop or an RTF document in Word.
But what if you now want to import that image or text file into Adobe InDesign? No problem: After you save any edits in your document, move your cursor over the little icon to the left of the file’s name in the title bar. Now hold down the mouse button and begin to drag the icon. You can drag that “proxy” icon into any other open window, including an InDesign document.
If you can’t see the window you’re aiming for, keep the mouse button held down and press Command-Tab (the Mac OS X application switcher) to switch applications or use Expose to find the window you want. This drag-and-drop technique is only available on Mac OS X, and only after you have saved a file.