Extend the Dock and get window previews whenever you hover your mouse over an app.
DockView is a desktop customization app that lets you take a neat trick from Windows and mimic it in Snow Leopard: with DockView running, when you mouse over an app's icon in the Dock, you can instantly see live thumbnail images for all the windows open in that app.
Menu extras: CPU, disk, memory & network monitoring.
Window management to divvy up your screen into exact portions.
Hover over the Dock for window previews and enables window snap.