On Page:

http://www.squeak.org/Community/

is a bullet point under the heading "Mailing Lists" as follows:
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Three lists are dedicated to squeak in general. For more information, or for subproject mailing lists, see the wiki page.

• Announcements is the first list everyone interested in Squeak should subscribe to, even if you subscribe to not other list. This list has a very low traffic level but will keep you up to date on events and new releases.