DockView extends Mac OS X’s Dock and shows window previews whenever you hover your mouse over an application or while using CMD+Tab. It helps you visualise the windows you currently have open and easily find the window you are looking for.
DockView has been temporarily removed from sale and it is currently being rewritten from scratch. Please check back in a while, DockView should be back soon! In the meantime, check out my other app, Dash.