Bridge

In talking to fellow designers, I have been surprised to find out how few of them actually make frequent use of Adobe Bridge. It is software that is often ignored, but I have found it to be a major aid to my work process. I probably spent more time in bridge than I do in illustrator. Being a file browser, you wouldn't expect that it would be very powerful, but if you actually take a look at it you will see that it is incredibly powerful and very useful. You can view thumbnails and previews of every file type supported by Adobe. (which you cannot do in Finder, Preview, or Windows Explorer) You can also place files into any other Adobe CS program directly from bridge. This saves a lot of time and avoids the annoying issue of having to locate a file twice (First to view it, then to Place it) You can even output contact sheets and Flash galleries directly from Bridge. this program really helps my workflow, and I would encourage other designers to start using it, instead of being stuck in the OS.