Google Apps email lists (now called "groups") now support two improvements:
– Admins can now set permissions to determine who can send to each group: group owners, group members, domain members and/or anyone in the world.
– Groups can now contain other groups, making it easier to reuse frequently-referenced groups of users.

Editions included:
Standard, Premier, Education and Partner Editions.

Languages included:
US English

How to access what's new:
Sign in to the control panel and click 'Users and groups' and then 'Groups' to manage groups.

For more information:
http://www.google.com/support/a/bin/answer.py?answer=126169&topic=14869

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