A new case study was just released on ADM (Archer Daniels Midland), about how they chose to revamp their web presence using Sharepoint in a externally-facing way supported by our partner Avanade.  This is a trend we are seeing among larger companies as they recognize that their external web presence needs to be less about static content publishing and more about the ability to manage dynamic content, provide advanced customized user experiences, and particpiate in inbound/outbound content syndication as a social network.

Another case study showcasing Sharepoint as an external web solution is Cadence Design Systems:  http://www.microsoft.com/casestudies/casestudy.aspx?casestudyid=4000003532