Qubes - A Highly Secure OS Powered By Xen Hypervisor

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Qubes is an open source operating system based on Linux, which is designed to provide strong security for desktop computing. Its unique selling point is that all applications that are run on Qubes is sand-boxed from each other.

This is achieved by way of virtualization of all applications using Xen Hypervisor.

Avant Window Navigator for Ubuntu Linux

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Avant Window Navigator (AWN) is a Mac OS X like panel for the GNOME Desktop. In addition to launchers that can be dragged onto the bar, it features a taskbar that behaves similarly to the Mac OS X dock. The window navigator uses the composite extension for transparency and other effects.

The latest version of Avant Window Navigator - as of this writing - is version 0.4.