This is the closest to Pattern & Practices information Microsoft has released for SharePoint environments. Should be a great resource for Architects and Developer Leads.
This guidance helps architects and developers design, build, test, deploy, and upgrade SharePoint intranet applications. A reference implementation demonstrates solutions to common architectural, development, and application lifecycle management challenges.
http://www.microsoft.com/downloads/details.aspx?FamilyId=C3722DBA-6EE7-4E0E-82B5-FDAF3C5EC927&displaylang=en