The Tuscany WIKI has been moved to http://cwiki.apache.org/confluence/display/TUSCANY/Home
Tuscany is an open source implementation of Service Component Architecture (SCA), and its associated data manipulation service Service Data Objects (SDO).
Tuscany exists at present in three forms. The Java and C++ versions are under incubation at apache.org, whilst the PHP version is hosted on PECL.
The main Tuscany web site is http://incubator.apache.org/tuscany/
Further wiki pages for each language specific project:
There is also an area for Proposals to the Specification.