We've used Google Groups for discussion email lists.
If you can, I would suggest starting up the specific grant groups within
the http://groups.crisiscommons.org and people can join there. This is
most likely for a smaller group of people and we can work through the
ways to utilize the Wiki pages, forum discussions, task lists, and file
sharing capabilities. There is "notification" options in these that can
be used.
Andrew
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Andrew Turner
m: 248.982.3609 e: and...@highearthorbit.com t: @ajturner
b: http://highearthorbit.com w: http://geocommons.com
Introduction to Neogeography - http://oreilly.com/catalog/neogeography