Here are the relevant links from my talk on Identity at Net Squared.

US, Our Organizations and The Web: Leveraging Identity Tools for Collaboration

Why is user-centric Digital Identity Important?
Augmented Social Network: Building Identity and Trust into the Next Generation Internet 2003, Ken Jordan, Jan Hauser, Steven Foster.

OpenID
OpenID

Data Linking

Standards
XRI Wikipedia at OASIS
XDI Wikipedia at OASIS

Companies
Strong Eye
Kintera & XDI
GoLightly
ooTao

i-cards
Identity Blog - Kim Cameron MSFT Identity Architect
Higgins Project at Eclipse
OSIS - Open Source Identity Systems (interop work with over 50 companies and projects)

Vendor Relationship Management
Project VRM at the Berkman Center, Harvard

Collaboration Community for the Evolving Identity and Relationship Layer
Identity Commons

EVENTS I INVITE YOU TO
Vendor Relationship Management Workshop
July 10-12, Boston

Internet Identity Workshop #7
November 10-12, Mountain View
Data Sharing Summit #3
September?

BONUS RESOURCES

Identity Community Foundational Resources

Laws of Identity

OECD Paper: At the Crossroads: Personhood and Digital Identity in the Information Society

Additional White Papers of Interest

Accountable Net: Peer Production of Internet Governance

Appropriating Technology for Social Change

Movement as Network

Network Centric Advocacy 2003

Simple Open Standards you can adopt now
OAuth
Microformats
XRDS - Simple
Open Social