EmailList-Managers - join
A help list for listowners and moderators using any service or software, Google Groups Beta, Yahoogroups, Smartgroups, Topica, Mailman, Majordomo, and more. The EmailList-Managers FAQ website: http://www.emaillist-managers.com/
Low activity, 734 members, restricted

Yahoogle - join
Yahoogle helps people understand their options when migrating to or from YahooGroups and GoogleGroups.
Low activity, 3655 members, moderated, restricted

Groups Test Group - join
Unofficial Google Groups test group. Group owner: Tomi Häsä.
Low activity, 306 members, restricted

EL-M-ComputerHelp - join
The EL-M Computer Help list is a sister list to EmailList-Managers, to help listowners and list members with computer, browser, internet and/or software problems. Feel free to ask any questions, no matter how basic!
Low activity, 258 members, restricted

Listhelp - join
No Posting On This Group, Please! This is a mirror of the active Listhelp group at Yahoogroups To join the active ListHelp group at YahooGroups, click this link: http://tech.groups.yahoo.com/group/ListHelp/join We look forward to seeing you over on YahooGroups!
Low activity, 79 members, moderated, restricted

Google Calendar Help (Archived) - join
Welcome to the Google Calendar Help Forum Archive! Please note that this forum is only an archive and you can no longer post questions here. Please see our new forum here: http://www.google.com/support/forum/p/Calendar?hl=en
44698 members, restricted

Google Labs - Notebook - join
This is a discussion forum where you can exchange information with other Google Notebook users.
Low activity, 2968 members, restricted

GMusers- GMail Beta & Beyond - join
A core group of GMail users who expect to be using GMail through beta and beyond. The list is moderated. There are multiple moderators in order to preserve diversity of opinion and a smooth flow of posts. GMusers is open and globally inclusive. You do not need a GMail account to join.
Low activity, 3195 members, moderated, restricted