Sterling is a lightweight object-oriented database implementation for Silverlight and Windows Phone 7 that works with your existing class structures. Sterling supports full LINQ to Object queries over keys and indexes for fast retrieval of information from large data sets.

Notes from PDC Session

Great set of general tips to take into account when building an app.

Tim Heuer's excellent blog post on the subject.

Good tutorial about how to create sample data from your ViewModel.

If you're an iPhone developer accustomed to working with Xcode and Interface Builder, check out this video where you’ll find all about the tools for developing Windows Phone 7 apps! You’ll learn the fundamentals of Visual Studio 2010, the Windows Phone emulator and Microsoft Expression Blend for Windows Phone.

This new guide from patterns & practices will help you design and build applications that target the new Windows Phone 7 platform.

The key themes for these projects are:

1. A Windows Phone 7 client application
2. A Windows Azure backend for the system

As usual, we'll periodically publish early versions of our deliverable on this site. Stay tuned!

The main purpose of the toolkit is to accelerate the creation and development of MVVM applications in WPF, Silverlight and in the Windows Phone 7.

Silverlight for Windows Phone Toolkit offers developers additional controls for Windows Phone application development, designed to match the rich user experience of the Windows Phone 7.

An open source REST client for .NET

Ninja is a Light and nimble database for Windows Phone 7. It is under 100KB and is built for high performance.  Easily save and load any public object to isolated storage.

siaqodb is an object database engine that currently runs on .NET 3.5+, Mono 2.4+, Silverlight 3 and 4 as well as WP7. It’s database management application allows you to use LINQ to run ad-hoc queries against the database, which is kind of a cool and unique feature.

db4o is an object-based database (as opposed to a relational database) designed for use in Silverlight and .NET applications. Since there is Silverlight 3 support, it *should* work on WP7.

Embeddable database for Windows Phone 7. $395 for commercial apps.

This project implements a Isolated Storage (IsolatedStorage) based database for Windows Phone 7. The database consists of table objects, each one supporting any number of columns.

The MVVM Light Toolkit is a set of components helping people to get started in the Model - View - ViewModel pattern in Silverlight and WPF. It is a light and pragmatic framework that contains only the essential components needed.