If you're a graphic designer or you otherwise work a lot with images, File Juicer can be an extremely useful (if narrow in purpose) utility. Like a kitchen juicer extracts juice from fruits and vegetables, this application "juices" a wide variety of image formats and even audio and video out of almost any kind of file, from browser caches to Microsoft Office docs--so for example, you can drop a PowerPoint onto File Juicer, and the app will extract any images, text, and even Flash and ZIP files from the presentation.
File Juicer excels at its core purpose, with a very straightforward, drag-and-drop interface, but it also has a few other secondary uses, including unerasing photos from digital camera flash cards, extracting "slightly corrupt" JPEGS from older Flash files, and reconstituting Word docs out of PDFs--which it accomplishes with varying degrees of success and complexity, depending on your situation. File Juicer has a responsive developer, lots of user "hints," and fairly substantial online help.
Extract/recover images, video, audio and text from files, folders, flash cards and iPods. File Juicer will extract images from PDF, PowerPoint, Excel or Word just as it will extract them from flash cards. It considers all files as the peel of an orange which can be removed and the contents extracted. Extract images from a PowerPoint slide show or presentation. Extract images and text from PDF files. Recover images and video from erased flash cards. Recover text from damaged files. Extract the images and HTML files in Safari's cache.