Some articles from around the net that talk about SCA/SDO and Tuscany. Candidates for the Resources section of the Overview page on the web site.
osoa.org - Current home of the SCA/SDO Specs
Open OASIS Service Component Architecture
osoa.org - Interesting SCA resources
osoa.org - Interesting SDO resources
Real SOA - Web services and Service Oriented Architecture
What is SCA
What is SDO
Building SOA with Tuscany SCA
Holy grail of services: SCA
Taking your first steps with SCA
What can Service Data Objects do for your SOA system
Implementing Platform Independent Data With SDO
Henning Blohm - Setting Out for SCA
David Chappel's Introducing SCA
http://www.infoq.com/news/2007/07/scaproblem#view_8587
Feathercast Issue 35 (http://feathercast.org/) talks about Apache Tuscany
Build mashups with the Service Component Architecture and Apache Tuscany - Andrew Borley
Using the Eclipse SOA Tools Platform plug-in and Apache Tuscany - Tyler Anderson
Service Component Architecture (SCA) lets you invoke components from different technologies - Dan Becker