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:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/spptsdk/html/SPSDKWelcome_SV01017094.asp?frame=true

Download the SDK:
http://www.microsoft.com/downloads/details.aspx?FamilyID=aa3e7fe5-daee-4d10-980f-789b827967b0&DisplayLang=en

– 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!