Some of the easiest and most useful things you can add to OSX are Menubar items; little applications that live in the menubar across the top of your screen. App launchers, notifiers, Web & RSS trackers, shortcuts to system functions and more are just some of the things available to you.

I came across this list of Super Menubar Items the other day and thought it worth linking to. The list is categorized for easy searching and includes the menubar icon, description, link to the site, and cost (most are free). I'm not sure how old the list is, nor have I tried every item on it, so some may work with Leopard, some only with Tiger. But it's definitely worth checking out if you're looking for ways to save time and screen real estate.