What is Identity 2.0 and as a web developer, why do I care?

I’m not really sure what Identity 2.0 is but here are some very interesting slide show talks about it, and it looks to be solving some very interesting web security problems. 
 
 OSCON 2005 Keynote – Identity 2.0 – Dick Hardt – Founder & CEO , Sxip Identity 	 Who is the dick on your site? 	 http://identity20.com/ 	 Identity 2.0 article by Kate Greene