Mindgrub Founder and President, Todd Marks offers a definition to the next paradigm shift of digital information delivery: "The Web 3.0 is the perceived next generation release of the internet. It takes into effect the hottest trends of the web 2.0, including rich internet applications and social media, and brings them to the new hardware of the outerweb, namely mobile devices, netbooks and digital signage. Information is searched for, filtered, personalized and delivered to end users based on preferences, biofeedback and location."
Wikipedia's definition can be found here: http://en.wikipedia.org/wiki/Web_3.0