SymbolicLinker is a tiny contextual menu plugin (for Puma through Leopard users) and software service (for Snow Leopard & later users) that, once installed, allows any user to create symbolic links to files inside the Finder. SymbolicLinker does this by adding a contextual menu item to the Finder that generates symbolic links to the selected files.
Dan Frakes recently wrote a review of SymbolicLinker for his MacGems column at Macworld, which explains more about why you would want this handy little add-on for OS X. Needless to say, if you know you have the need for creating symbolic links, this app will save you trips to the Terminal each time you need to do it.