Complete curiosity. I love Rackspace, but am always looking to try new things - new languages, new databases, new methods of hosting, new DNS, new foods, new music - I'm just a curious person. It's not problem with Rackspace; all of my mission-critical stuff is still hosted with you. But I use random projects of mine to to explore in multiple ways (including Black Sands by Bonobo, which I discovered last week - possibly my favorite coding album now).