Windows: Some programs seem like they should come by default with Windows. FoldersPopup gives you one-click access to your favourite folders and locations.
Mac: If you make a lot of folders for your projects, you know it can be a pain to get things organised. Post Haste is a free Mac app that allows you to create project-based templates so you can get started immediately.
Windows: Creating a new folder in Windows is easy, but not necessarily fast. Smart Folders is a simple little app that turns folder creation into a simple, one-step process.