"In essence, Sales 2.0 is the marriage of next-generation and Web-based 2.0 technologies and services to innovative sales processes resulting in accelerating revenue goals at a decreased cost of sale to sustain a competitive advantage. These technologies include software and services for web conferencing and contact engagement, social networking, website and email response tracking, community software, blogs, video, lead enrichment services, survey tools and next-generation customer relationship management systems (“CRM 2.0”) as well as technologies so new that their categories have not yet been defined." (http://www.phoneworks.com/resources/newsletters/200708.htm)
Overview article at http://www.phoneworks.com/resources/newsletters/200708.htm
Blog at http://sales20.dreamhosters.com/
This article  has a graphic by Jeff Weinberger comparing Sales 1.0 to Sales 2.0 practices and concepts.