There has never been a clear definition or discussion how the Internet of Things differs from Pervasive Computing, Ubiquitous Computing, Smart Things, Ambient Intelligence etc. - all areas have many, and undefined, communalities and overlaps. Also, in the end it does not really matter, in a few decades historians may look back and come up with clear definitions in retro-spect.
What the internet is really about, as the first conference has set out in 2008 , is the "expansion of the internet into the real world". This "new" internet can be build upon the backbone of internet technology as suggested by  or  using DNS, TCP etc.. Just recently, one can realize another term getting established - Web of Things (good overview here ) - which views the very same phenomenon of expansion from a more high-level perspective of applying web technologies to controlling embedded devices and appliances by URI, HTTP, REST, RSS, etc.
Honestly, I haven't quite understood the difference between Internet of Things and Web of Things, perhaps there isn't really one except the ownership of terms;)
Anyway, let's just move on, build stuff, develop meaningful apps and let's not worry to much about how to name them. And yes, gee, I forgot, there is of course also the Web2.0 which emerges in to the real world as well being called Web3.0 then...
 Toward a Global "Internet of Things", http://java.sun.com/developer/technicalArticles/Ecommerce/rfid/
 Neil Gershenfeld, Raffi Krikorian, Danny Cohen: Internet 0: Interdevice Internetworking, Scientific American, 2004
 Neil A. Gershenfeld: When things start to think, Henry Holt, 2000 (reprint) Marc Weiser: The Computer for the 21st Century" - Scientific American Special Issue on Communications, Computers, and Networks, September, 1991
 ITU Internet Reports 2005: The Internet of Things
 Internet of Things 2008. International Conference for Industry and Academia March 26-28, 2008 / Zurich
 EPCglobal, The EPCglobal Architecture Framework, Version 1.3, Jan 2009
 Dave Raggett: Towards the Web of Things, W3C, September 2007