The February 2007 issue of Sustaining Repositories reports that more US institutions are using or investigating a combination of Fez and Fedora (see the below quote):
Fez programmers at the University of Queensland (UQ) have been gratified by a surge in international interest in the Fez software. Emory University Libraries are building a Fez repository for electronic theses. Indiana University Libraries are also testing Fez+Fedora to see whether to replace their existing DSpace installation. The Colorado Alliance of Research Libraries (http://www.coalliance.org/) is using Fez+Fedora for their Alliance Digital Repository. Also in the US, the National Science Digital Library is using Fez+Fedora for their Materials Science Digital Library (http://matdl.org/repository/index.php).
