One of the most vexed questions within the open source world is when, if ever, GNU/Linux will take off on the desktop. Strangely, this isn't really about capabilities: as someone who has Ubuntu running on both of his main systems, I can attest to the fact that GNU/Linux is not just usable, it's a downright pleasure to use. In fact, I constantly marvel at how transparent open source has become: most of the time I'm simply not aware that I'm using it – it just works.