Also read the following related blog posts:

• Google Account Service Names – 17 May 2006 22:59
• What is Google Weaver? – 7 Jun 2006 07:30
• Google RS2, SSD and Mobile Download Console – 10 Jun 2006 08:53
• Google LH2? – 11 Jun 2006 10:20
• What's in Google's Sandbox? – 27 Jul 2006 23:50
• Blogger.com to finally use Google Accounts? – 8 Aug 2006 21:20
• Blogger definitely migrating to Google Accounts – 11 Aug 2006 13:33
• The Search for Secret Google Services – 12 Aug 2006 09:14
• Google Marketing Tools – 13 Sep 2006 20:00
• Google Online Assessment and Google Workplace? – 8 Dec 2006 13:12
• GAM and Fiji: New Google Services? – 12 Dec 2006 23:08
• AdSense coming to Google Apps for Your Domain? – 16 Jan 2007 13:54
• Google Apps to add Docs and Spreadsheets – 6 Feb 2007 14:03
• What is Google WWW10? – 7 May 2007 22:37

• [*] Attempting to login to these services shows a page that’s different to the standard Google Accounts login pages: Login, ServiceLogin
• [0] “The page you requested is invalid.”
• [1] “Invalid request.” (Invite only.)
  Update: 11 October 2006 (12:56) Some services which previously returned error [0] now return [1] instead – these are marked [1b].
• [2] “User has not signed up for the service.”
• [3] Previously, this link returned a 500 error status and displayed the following text: “Sorry, there seems to be a problem. The service you’re looking for is temporarily unavailable. We’re working hard to restore your access as soon as possible. Please try again in a few hours. Thanks for your patience.” Since 27 Jun 2006, this link now returns the usual error [0].
• [4] Previously, this link redirected to the generic NewAccount page. Since 28 Jun 2006, this link now redirects to the sign up page for Google Checkout. All occurrences of Purchases appear to have been rebranded as Google Checkout from this date too.
• [5] Previously, this link returned the usual error [2] but once signed up with Google Checkout, it now displays an “Edit Google Checkout” page.
• [6] Previously, this link redirected to a page asking users to sign up to try out Google Spreadsheets.
  Update: 12 October 2006 (08:37) And “Google Spreadsheets” has now been rebranded as “Google Docs & Spreadsheets” in an attempt to integrate with the “Google Writely” service.
• [7] Whilst all pages return errors, the code name is referenced on several pages in the Google WiFi Help pages.
• [8] Previously, this link returned the usual error [0].
  Since 8 August 2006, this link now returns the standard NewAccount page.
  Update: 12 August 2006 (09:16) It seems this now returns the usual error [0] again.
  Update: 14 August 2006 (17:26) And it’s back again! More about this on my blog.
  Update: 14 August 2006 (22:32) And now Blogger Beta is part of Google Accounts! More on my blog.
• [9] Previously, this link redirected to a Sign up for Picasa Web Albums page.
• [10] Previously, these links returned the usual errors but were made live on 21 September 2006.
  Update: 11 October 2006 (08:39) “Google Writely” has now been rebranded as “Google Docs & Spreadsheets” in an attempt to integrate with the “Google Spreadsheets” service.
• [11] This link redirects to the sign up page for the Checkout Sandbox.
• [12] Limited test only. This link only works with corresponding and valid continue, ltmpl and sig parameters, like this.
  Update: 8 April 2008 (08:36) This service name is now also used for the limited preview of Google App Engine, so the same login page can be used with different parameters like this.
• [13] It seems you can currently only link YouTube accounts to existing Google Accounts.
• [14] Update: 31 July 2007 (13:15) Service disabled.
• [15] Update: 5 September 2007 (10:00) Login pages for “jotspot” were disabled on either 4 or 5 September 2007, although the “DisableService” page is still active.
• [16] Update: 6 September 2007 (10:00) Google has disabled the “DisableService” page for all services that you can't yet add to your Google Apps account. The “DisableService” page does, however, still appear for the other services even if you have not yet added them to your account.
• [17] Update: 25 September 2007 (12:32) This page now redirects to http://www.google.com/fiji/r/login.
  Update: 9 July 2008 (08:27) Turns out this service is used by Lively by Google which was released on 8 July 2008. Read more about this on Google Blogoscoped.
• [18] Update: 12 November 2007 (21:19) Previously, these links returned the usual errors [1] and [2] but now return the standard NewAccount and EditUserServiceData pages.
• [19] Update: 24 November 2007 (11:36) Login pages for “jotspot” were enabled again, although the service name displays as “Error”.
• [20] Update: 26 January 2008 (14:30) The service name for “health” changed from “Google Health” to “New Service” on 24 January 2008 and the login pages for were changed back to the standard template on 25 January 2008. Read more about Google Health on Google Blogoscoped.
  Update: 19 May 2008 (17:53) Google Health is now live. Read more about this on Google Blogoscoped.
• [21] Update: 21 February 2008 (14:24) Previously, these links returned the usual errors [1] and [2] but now return the usual pages. Read more about this on Google Blogoscoped.
  Update: 19 May 2008 (17:53) Google Health is now live. Read more about this on Google Blogoscoped.
• [22] Update: 28 February 2008 (14:10) Previously, this link returned the usual error [16] but Google Sites has now been launched.
• [23] Update: 24 March 2008 (09:10) Previously, these links returned the usual Google Apps “Service not available” page with “Prometheus” as the title. They now return “The page you requested is invalid.” which is similar to the standard Google Accounts [0] error.
• [24] Update: 8 April 2008 (08:36) This service name is now used for the limited preview of Google App Engine, so the ServiceLogin link only works with corresponding and valid continue, ltmpl and sig parameters like this. The “DisableService” page – which previously returned error [16] – also works now.
• [25] Update: 23 July 2008 (20:20) Previously, these links returned the usual errors [1] and [2] (since the Knol announcement in December 2007) but now return the usual pages as Knol was finally released on 23 July 2008. Read more about this on Google Blogoscoped.

With thanks to:

• Philipp Lenssen at Google Blogoscoped
• Members of the Google Blogoscoped Forum
• Ionut Alex. Chitu at Google Operating System
• TOMHTML at Zorgloob