"The Windows Phone SDK 7.1.1 Update – CTP provides a new 256 MB device emulator image and an updated 512 MB emulator, and it provides the ability to deploy, run, debug and profile your Windows Phone applications and games in the 512 MB emulator or the 256 MB emulator. "
“A Case Study for Building Advanced Windows Phone Applications: Connecting with Cloud Services"
"The Windows Phone DataContext feature allows you generate a DataContext for use in Windows Phone projects, based on an existing database, saving you a large coding effort."
"Microsoft is pleased to announce the beta release of the Amazon Web Services (AWS) SDK for Windows Phone. Built by Microsoft as an open source project, this SDK provides developers quickly connect and integrate Windows Phone applications with AWS (S3, SimpleDB, and SQS Cloud Services)"
"Choosing between Panoramas, Pivots and/or Pages"
Amazing list of a gazillion WP7 resources : "The Big Dummies Guide for Windows Phone Developer Resources"
Northern Lights WP7 Toolkit - collection of tools such as : "NagForReview will ask, after a fix set of days and/or application starts, the user to review your app", "The checking of the application version against a txt file on a remote server enables you to inform the user, on startup of the app, that a newer version of your application is available", "The LittleWatson class let's you catch unhandled exception and automatically report them back to you through a webservice or let the user e-mail to you the next time the user opens up the application"
"Winning on the Marketplace: The differentiation game"
"With App Connect, your application can be launched from the Pictures Hub, enabling a convenient launch experience for picture-related applications. This topic describes how to create an application that can be launched from the Pictures Hub."
"Get Your Windows Phone Applications in the Marketplace Faster"
"Performance Considerations in Applications for Windows Phone"
"Performance Techniques for Windows Phone"
Windows Phone Background Agents Pitfalls
"Analyzing and Improving Windows Phone Application Performance"
Task based asynchronous programming CTP
Detailed discussion on memory costs in WP7 "WP7: CLR Managed Object overhead"
"7 Deadly Sins for … Windows Phone Developer"
MetroGridHelper - "fix those margins, align, and try and make your apps as beautiful and inspiring as you can"
A version of MetroGridHelper that works at design time in Visual Studio/Blend
"Silverlight Validation WP7"
Really awesome, clear and concise guidelines for using Windows Phone 7 App Bar
"Designing Windows Phone Icons"
Great tutorial on creating icons in Expression Design
Record and playback sound
Dragging UI items
"An overview of fast application switching and page state in Windows Phone"
Introducing MoqaLate, (probably) The World's Only Mocking Framework for Windows Phone 7 (WP7)
"This sample is the bare bones “how to use accelerometer”"
Great guide from Telerik on how to market your app, contains advice and some great links.