I'm going to be co-ordinating Wikimania moderators.
If you would like to volunteer, please let me know as soon as
possible, along with details of whether there are any times you can't
do, or any sessions on http//wikimania2006.wikimedia.org/wiki/Schedule
that you have a preference for moderating.
Moderating basically involves introducing the speaker and then making
sure they finish on time, and sometimes handling questions from the
audience at the end when there's time for a Q&A session. You will also
need to find the speaker before the event and make sure they're happy
with the arrangements and know where they're going. You don't need any
technical knowledge since other people will be available for making
sure any recording devices and projectors are set up.