For yourself, as email facilitator-advocate, you should read
_Connections_ by Lee Sproull and Sara Kiesler.
[The next book by Lipnack and Stamps will also be on this topic.]
The basic organizational rule is balance -- don't have another
meeting without doing homework, don't do too much homework
without having a meeting. Since you still have recourse to
face-to-face meetings with these people, learn how to use email
to make your RealTime together more productive. Get people to
email out reports a reasonable space before meetings, etc.
Each team, and this board is no exception, will have to inch around
a bit in the saddle until comfortable. That is to say, no rules
fit all groups. But approach email as a complementary resource
and not a replica of face-to-face interaction and you will find
that the group is less boring to belong to.