In an attempt to chronicle the history of the Sidekick line, we’ve put together a Sidekick Timeline of release dates and notable days in the history of the Sidekick.
09/06/2001 - Danger unveils the first Hiptop
08/06/2002 - Danger partners with T-Mobile
10/01/2002 - Black and White Sidekick released
06/06/2003 - Color Sidekick released
08/22/2004 - Sidekick II released
10/??/2005 - Sidekick II Limited Editions (Mister Cartoon and Juicy Couture) released
10/??/2005 - Hiptop3.com launches
05/16/2006 - Sidekick II is discontinued
06/28/2006 - Sidekick 3 available to existing T-Mobile customers
07/10/2006 - Sidekick 3 released
10/31/2006 - Sidekick 3 Limited Editions (Diane Von Furstenberg and Lifted Research Group) released
02/21/2007 - Sidekick 3 Limited Edition D-Wade released
04/25/2007 - Sidekick iD released
10/16/2007 - Sidekick LX available to existing T-Mobile customers
10/24/2007 - Sidekick LX released (available in Midnight Blue and Espresso Brown)
11/07/2007 - Sidekick Slide released
04/??/2008 - Sidekick iD discontinued
05/??/2008 - Sidekick 3 OTA - Radio Firmware update
05/05/2008 - T-Mobile officially launches 3G rollout
05/16/2008 - Sidekick Slide Scarlet (red) released
06/05/2008 - Sidekick LX Limited Edition Tony Hawk released
07/??/2008 - Sidekick LX Video OTA starts rolling out to everyone
07/29/2008 - Sidekick 2008 Release Party
07/30/2008 - Sidekick 2008 (Gekko) released
08/??/2008 - Sidekick Slide is discontinued

Got something to add (or correct) to the list? Let us know!