patterns & practices SharePoint Guidance - SharePoint 2010 Release now Live on MSDN!!

Copy/paste from MSDN:

The following releases are designed to help solution developers and architects make the right decisions and follow proven practices when building applications for SharePoint

MSDN link : http://msdn.microsoft.com/en-us/library/ff770300.aspx

Codeplex link: http://spg.codeplex.com/