GMarks - join
Information and discussion relating to the GMarks extension for Firefox. GMarks shows your Google Bookmarks in a Firefox sidebar and helps manage them. GMarks is not made or supported by Google.
Low activity, 786 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

Google-Firefox-Extensions - join
This is a discussion forum where you can exchange information and discuss Google-developed extensions for the Mozilla Firefox browser.
Low activity, 5027 members, 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 Calendar Users - join
A discussion for anyone who needs help or advice on using Google calendar. Please post feature requests for the possible addition to Google Calendar at a later date. Follow me on Twitter: www.twitter.com/Get_Fit_Tips
Low activity, 2290 members, restricted

43 Folders - join
Lifehacks, productivity tricks, and OSX tips. Cousin of 43Folders.com by Merlin Mann.
Low activity, 4987 members, restricted

greasemonkey-users - join
List for general Greasemonkey discussion. This is the place for questions about creating or installing user scripts.
Low activity, 1913 members, restricted

Gmail-Users - join
Talk about Gmail, good or bad.
Low activity, 17936 members, moderated, restricted