HornWare's SharePoints has been around for a while, but I don't think I've ever mentioned it before and it definitely seems to warrant a little attention. SharePoints is an application or preference pane (your choice) that you can use to create, well, Share Points. In other words, if you want to share something other than your home directory with your mac this application will provide you with a gui to set those up quickly, easily, and intuitively.