Larry Lieberman on the Windows Phone Development Platform

Here's where I'll provide you great copious detail about the Windows Phone application platform
on WP Dev Center

Windows Phone DEV CENTER

Everything about building apps and games for Windows Phone starts here.

http://dev.windowsphone.com

Official Docs, DEVELOP (MSDN)

http://aka.ms/wp8devdoc

Official Docs, DESIGN (MSDN)

http://aka.ms/wp8devdesign

Official Docs, PUBLISH (MSDN)

http://wpdev.ms/getdevhelp

Downloads

http://aka.ms/wpdevdls

REGISTRATION Walkthrough

http://wpdev.ms/aboutreg

SUBMISSION Walkthrough

http://wpdev.ms/understandsub

CERTIFICATION Requirements

http://wpdev.ms/wpdevcertreq

Forums

http://wpdev.ms/wpdcforums

Content on MSDN

Primary Windows Phone node in the MSDN Library

This is our 'official' documentation. Note, not _all_ of the official documentation lives under this node. Since Windows Phone's application platform is predominantly based on Silverlight and XNA, you also need to be aware of the key nodes for those specific technologies as well. (supra.).

http://wpdev.ms/wponmsdn

MSDN Library, primary node for XNA Game Studio 4.0

This includes developing Windows Phone games using the XNA Framework, in depth.

http://wpdev.ms/xnaonmsdn

MSDN Library, primary node for Silverlight for Windows Phone, (WP7.1)

This is the Silverlight specific documentation for Windows Phone 'Mango'.

http://wpdev.ms/sl4onmsdn

Windows Phone User Experience Guidelines

This is pretty comprehensive, but a little to meaty for most folks. We'll have a lot more information about UX on Windows Phone in the coming weeks and months.

http://wpdev.ms/wpuxguide

Building a Windows Phone Application from Start to Finish

This is a pretty cool guide the P&P guys did, to walk you through the entire process of building an app.

http://wpdev.ms/starttofinish

Microsoft Patterns & Practices: WP Developer Guide

A set of three specific guides to building WP apps, from soup to nuts.

http://wpdev.ms/wppatt

"How To" Index

An index of all of the 'how to' documentation put together by the doc team.

http://wpdev.ms/wphowtos