Just released SharePoint SDKs; these look quite meaty -- The wss one weights in at nearly 34MB, compressed.
Windows SharePoint Services V3: SDK This SDK contains conceptual overviews, programming tasks, samples, and references to guide you in developing solutions based on Microsoft® Windows® SharePoint® Services (version 3). SharePoint Server 2007: SDK The Microsoft Office SharePoint Server 2007 (Beta) SDK contains conceptual overviews, programming tasks, code samples, and references to guide you in developing solutions based on Microsoft® Office SharePoint® Server 2007.
Windows SharePoint Services V3: SDK
This SDK contains conceptual overviews, programming tasks, samples, and references to guide you in developing solutions based on Microsoft® Windows® SharePoint® Services (version 3). SharePoint Server 2007: SDK
The Microsoft Office SharePoint Server 2007 (Beta) SDK contains conceptual overviews, programming tasks, code samples, and references to guide you in developing solutions based on Microsoft® Office SharePoint® Server 2007.
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