FYI, today I wrote a slide on Q4M to my weblog. I think might be
interesting for you since it explains not only the usage of Q4M but
some of internals as well.
The slides are avilable via:
http://labs.cybozu.co.jp/blog/kazuhoatwork/2008/05/slides_on_q4m.php
Hope you will enjoy it.
--
Kazuho Oku