There are two packages available for the Workflow Starter Kit for SharePoint and Visual Studio:


MOSS SDK and ECM Starter Kit –
combined the ECM Starter Kit with the MOSS SDK documentation and
samples, and we also included the WSS and Office Forms Server SDK
documentation so you only have to download and install one package.


Windows SharePoint Services Developer Resources – If you are only interested in WSS platform development, we combined the WSS SDK documentation with the Workflow Starter Kit.