Draw the line in the sand! It's the showdown the tech world has feared: Microsoft's upstart Windows 7 versus Linux. We've seen plenty of volleys back and forth from both camps over the past few days, thanks to the beta launch of the Windows 7 operating system. The new OS has a lot going for it--features that directly target the growing Linux base in the mobile PC market coupled with design elements that, honestly, look a lot like what we've seen in Linux desktop environments for some time now. But will that be enough to topple the best the open-source world has to offer?