What are the best resources for SharePoint 2010 development? Please do one answer per answer.
Let's start with community site: SharePoint Dev Wiki v2010.
I'd say the MSDN SharePoint Developer Center. Documentation is already almost in parity with the documentation of previous versions.
I've ploughed through all the session videos from SharePoint Conference. Alot of gems hidden away there! http://www.mssharepointconference.com
I have written a range of blog posts about moving a WSPBuilder solution from SharePoint 2007 to 2010.
Quite insightful if you have experience with SharePoint 2007 development.
MSDN Getting started ressource