Windows SharePoint Services 3.0: Software Development Kit

Download:  http://download.microsoft.com/download/e/2/b/e2b1d36c-ca25-4860-aedf-8eea2314637f/WssSDK.exe

Page details: http://www.microsoft.com/downloads/details.aspx?FamilyID=05e0dd12-8394-402b-8936-a07fe8afaffd&displaylang=en

 

SharePoint Server 2007 SDK: Software Development Kit and Enterprise Content Management Starter Kit

Download: http://download.microsoft.com/download/5/c/3/5c3a0634-2f0c-4761-958e-7fd93bf8ee30/OfficeServerSDK.exe

Page details: http://www.microsoft.com/downloads/details.aspx?FamilyID=6d94e307-67d9-41ac-b2d6-0074d6286fa9&displaylang=en