The Financial Accounting Standards Board (FASB) has gone live with it's new Accounting Standards Codification (ASC) Web site, a DITA-based application that provides all of the U.S. Generally Accepted Accounting Procedures (GAAP) standards through dynamic delivery of DITA-based content.

I have written up a deeper discussion of the project here: http://blog.reallysi.com/2008/01/live-dita-appli.html

The ASC site itself is here: http://asc.fasb.org/home