TechNet has developed the following pages in response to your feedback on the topics you want to read more about:

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Before you Begin
Office SharePoint Server 2007 offers significant enterprise capabilities that require planning and validation to configure correctly for your needs. Use these resources to support a successful deployment.
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Migration and Upgrading
These resources will help you migrate to Office SharePoint Server 2007 from Microsoft Office SharePoint Portal Server 2003, Windows SharePoint Services 3.0, or Microsoft Content Management Server 2002.
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Governance
Governance is the set of roles, responsibilities, and processes that help guide the development and use of a solution based on Microsoft SharePoint Products and Technologies. These tools and resources can help business decision makers and IT professionals govern their SharePoint Products and Technologies environment.
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Interoperability
Office SharePoint Server 2007 can help users aggregate and consume information from a range of different data sources and application platforms. Learn more about interoperability for scenarios such as enterprise search, composite applications, and integration with other business solutions.