There are many kinds of docs, some fancy, some simple. I use a simple attach to left side of screen, stay on top, bump windows to right, narrow ribbon that houses 65 small unique icons divided into groups that I use to quickly launch the myriad of tools I use during my development day. It doesn't cost much desktop space at all and provides an at-a-glance one-click-and-launch platform to start my apps/tools. For me, very useful, for others, perhaps not-so-much. But other people use different types of docks for various reasons. I research and none of the free ones met my needs. Prior to windows-7, this functionality was built-in. Windows 7 dropped it and I was forced to switch to a commercial product.