Over at MAKE:Blog is an interesting little project for those looking for ideas on what to do with your Raspberry Pi.  Using arkOS, a lightweight Linux-based operating system specifically designed for hosting applications you can build your own private cloud without a huge investment of money.  Once you have the basics running, installing Jacob Cook's open-source Genesis application provides you a web based interface for running all your apps.  If you are relatively familiar with Linux and Raspberry it shouldn't take you that long to be fully functional. 

"Twenty-three-year-old Jacob Cook is on a mission to help you create your own small piece of cloud on the internet, freeing you from other providers for services like file storage and sharing, web hosting, e-mail, calendars, music, and photos."

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