Mac OS X: Tab Launcher is an app launcher and organiser that uses manila folder-style coloured tabs as app drawers, each meant to be for a different category of apps (like System, Games or Writing). Using Tab Launcher allows you to keep little, if anything at all, in the actual OS X Dock, leaving it free to only show which apps are currently open.
Tab Launcher allows you to change the themes of every tab and folder, including colours, transparency and size. Everything is drag and drop, from resizing the launcher to adding apps to folders. To save space, Tab Launcher can auto-hide just like the Dock, sliding out from the screen edge when you need to use it, with only the tab labels themselves peeking out when you don't.
Tab Launcher will cost $US0.99 (following a limited period at launch of being free). If you're interested in other styles of app launchers for Mac, check out previously mentioned Quicksilver, and, more recently covered Alfred.
Tab Launcher [Mac App Store]