According to Publishers Weekly (June 9, 2008, p. 20):
"In mobile-Web news, MPS Mobile, a subsidiary of Macmillan Publishing Solutions, which is also owned by Holtzbrinck, made two announcements about its Global Reader platform, which gives access to digital book content via mobile phones and other Internet-enabled mobile devices in over 160 countries. The first was that MPS Mobile will adopt the IDPF ePub standard for use on the Global Reader. (...)"
The second had to do with the design of the Global Reader.
ePub expands
You can read the full article online here. --Alex