It should be a long transition - for quite some time (or permanently?)
the two groups should run in parallel. Yahoo is a proven platform,
handles thousands of members seamlessly, etc.

LinkedIn is still new, changing rapidly, discussion groups are a part
of it but that's not a high priority, paid/unpaid status greatly
affects things (not always for the better) etc. It is still a mystery
to most how/when to join groups there and how/when/what digests to
receive - this seems to vary and is quite confusin for now.

Tom Lassu
http://filmsynergy.com
http://normanberns.eventbrite.com