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WindowBlinds, by Stardock, used to be a full-blown desktop shell replacement, but now it's a tool for improving the look and feel of the Windows 7 shell.
You won't be adding widgets and new and improved menus with WindowBlinds. But the enhanced appearance of the Windows 7 interface can be fairly dramatic. This shell costs $19.95
bbLean is one of two BlackBox clones we'll look at here. BlackBox was always considered one of the lightest, fastest window managers in the Linux environment. So if you want a desktop shell for Windows that is incredibly fast and minimal, bbLean is a great choice.