DITA Infocenter (www.ditainfocenter.com) is a demonstration of online Eclipse Help that contains the DITA Language and Architectural Specifications (v1.0) and the 1.3.1 version of the DITA Open Toolkit User Guide, all in a single, searchable interface with  a TOC and Index.

When the v1.1 DITA Specs are approved, they too will be included.