The latest release of the SharePoint SDK has seen some significant improvements, I know the content teams have been working really hard on these.

Browse/View the SDK in the MSDN Library:

Download the SDK:

– SQL Full-text Search Syntax
– Protocol Handlers Reference and Overview
– An expanded introduction to SharePoint Portal Server
– Expanded Concepts and Architecture section with new topics about 
       o    Profiles and Personalization
       o    Search
       o    Enterprise Application Integration

So get downloading….and reading!