You can download the SDK from this location: http://www.microsoft.com/downloads/details.aspx?familyid=05e0dd12-8394-402b-8936-a07fe8afaffd&displaylang=en
Note (August 29, 2008): As of August 29, 2008 the link does take you to the 1.4 version of SDK. (Randall Isenhour)
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The file is version 1.4 of the "developer resources"; the content is a SDK that applies to WSS 3.0.
For consistency, the "resources" could have also been designated as "version 3). (gerry lowry)
content of WssSDK.exe:
2008-08-20 01:21 8,008 Readme.htm
2008-08-20 01:21 38,110,260 WSS3sdk.chm
2008-08-20 01:21 4,214,005 WSS3SDK_TechArticles.chm
3 File(s) 42,332,273 bytes
Directory of ... \Samples
2007-01-31 17:34 30,208 WorkflowVSProjectTemplatesReadme.doc
Directory of ... \Samples\ASPXCollectFeedback
2007-01-31 17:34 596 CollectFeedback.snk
2007-03-20 10:51 1,923 CollectFeedbackWorkflow.sln
2007-03-20 10:51 3,216 InstallAll.bat
2007-03-20 10:51 608 QuickPagesUpdate.bat
2007-03-20 10:51 1,544 QuickUpdate.bat
5 File(s) 7,887 bytes
Directory of ... \Samples\ASPXCollectFeedback\CollectFeedbackAspxPages
2007-01-31 17:34 596 CollectFeedback.snk
2007-03-20 10:51 3,062 CollectFeedbackSampleAspxPages.csproj
2007-03-20 10:51 3,207 FormData.cs
2007-03-20 10:51 9,099 WFAssoc.aspx
2007-03-20 10:51 13,724 WFAssoc.cs
2007-05-30 11:11 8,392 WFDataPages.cs
2007-03-20 10:51 7,424 WFInit.aspx
2007-03-20 10:51 6,703 WFInit.cs
2007-03-20 10:51 7,155 WFMod.aspx
2007-03-20 10:51 4,805 WFMod.cs
2007-03-20 10:51 2,512 WFTDisplay.cs
11 File(s) 66,679 bytes
Directory of ... \Samples\ASPXCollectFeedback\CollectFeedbackSchedule
2007-03-20 10:51 3,508 CollectFeedback.csproj
2007-01-31 17:34 596 CollectFeedback.snk
2007-03-20 10:51 640 feature.xml
2007-03-20 10:51 3,290 FormData.cs
2007-03-20 10:51 2,360 workflow.xml
2007-03-20 10:51 9,752 Workflow1.cs
2007-03-20 10:51 22,459 Workflow1.designer.cs
7 File(s) 42,605 bytes
Directory of ... \Samples\ASPXCollectFeedback\CollectFeedbackSchedule\Properties
2007-03-20 10:51 1,295 AssemblyInfo.cs
2007-03-20 10:51 1,116 Settings.Designer.cs
2007-03-20 10:51 203 Settings.settings
3 File(s) 2,614 bytes
Directory of ... \Samples\ASPXCollectFeedback\TaskWorkflowContentType
2007-01-31 17:34 596 CollectFeedback.snk
2007-03-20 10:51 620 Feature.xml
2007-03-20 10:51 5,086 TaskWFCT.aspx
2007-03-20 10:51 4,795 TaskWFCT.cs
2007-03-20 10:51 2,638 TaskWorkflowContentType.csproj
2007-03-20 10:51 935 TaskWorkflowContentType.xml
6 File(s) 14,670 bytes
Directory of ... \Samples\ASPXCollectFeedback\TaskWorkflowContentType\Properties
2007-03-20 10:51 1,435 AssemblyInfo.cs
Directory of ... \Samples\IRM Doc Protector
2007-07-13 13:15 730 IrmProtectors.reg
2007-07-13 13:15 1,414 SampleDocProtector.sln
2 File(s) 2,144 bytes
Directory of ... \Samples\IRM Doc Protector\SampleDocProtector
2007-07-13 13:15 3,620 Globals.h
2007-07-13 13:15 3,890 ReadMe.txt
2007-07-13 13:15 550 resource.h
2007-07-12 12:59 4,788 sampledocprotector.aps
2007-07-13 13:15 1,487 sampledocprotector.cpp
2007-07-13 13:15 225 sampledocprotector.def
2007-07-13 13:15 4,577 sampledocprotector.idl
2007-07-13 13:15 2,902 sampledocprotector.rc
2007-07-13 13:15 141 sampledocprotector.rgs
2007-07-13 13:15 7,103 sampledocprotector.vcproj
2007-07-13 13:15 212 sampledocprotectorps.def
2007-07-13 13:15 4,168 sampledocprotectorPS.vcproj
2007-07-13 13:15 28,154 SampleProtector.cpp
2007-07-13 13:15 2,732 SampleProtector.h
2007-07-13 13:15 761 SampleProtector.rgs
2007-07-13 13:15 214 stdafx.cpp
2007-07-13 13:15 1,450 stdafx.h
17 File(s) 66,974 bytes
Total Files Listed:
56 File(s) 42,567,489 bytes (gerry lowry)