Code name Tahoe - IT all started here

SharePoint Developers History 101
http://sharepoint.microsoft.com/blog/Pages/BlogPost.aspx?PageType=4&ListId={72C1C85B-1D2D-4A4A-90DE-CA74A7808184}&pID=467

Digital Dashboard (1999-2000)
http://www.microsoft.com/en-us/news/press/1999/sept99/ddrkpr.aspx
http://www.microsoft.com/en-us/news/features/1999/09-20ddash.aspx
http://msdn.microsoft.com/en-us/magazine/bb984975.aspx

Tahoe (2000)
http://msdn.microsoft.com/en-us/library/aa140204(v=office.10).aspx

Microsoft SharePoint Portal Server 2001
http://msdn.microsoft.com/en-us/library/dd583170(v=office.10).aspx

SharePoint Portal Server 2003
http://msdn.microsoft.com/en-us/library/dd583133(v=office.11).aspx
http://msdn.microsoft.com/en-us/library/bb931735(v=office.12).aspx

Interactive Map SharePoint 2007
http://msdn.microsoft.com/en-us/office/bb497969.aspx

SharePoint Services 3.0 and MOSS Integration
http://msdn.microsoft.com/en-us/library/ms454209(v=office.12).aspx

Sharepoint 2007 Developer Center
http://msdn.microsoft.com/en-us/office/aa905503

SharePoint 2010
http://msdn.microsoft.com/en-us/sharepoint/default.aspx