This is a community wiki list of Windows Phone 7 resources. Feel free to edit/add/etc.
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[Actual Name of resource with a link]
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General Information
App hub - central place for windows phone/xbox development tools/tutorials/info
Windows Phone Home
Windows Phone Team blog
Programming Guide
Class Library Reference
Microsoft Patterns & Practices: Windows Phone 7 Developer Guide
Blogs
Den by default: Windows Phone 7
.NET Zone: Windows Phone 7
Shawn Wildermuth: Windows Phone 7
Jeff Blankenburg: 31 Days of Windows Phone
Articles
Building a Windows Phone 7 Puzzle Game
Windows Phone 7 View Model Style Video Player
Perst - a database for Windows Phone 7 Silverlight
Understanding the Windows Phone Application Execution Model, Tombstoning, Launcher and Choosers:
(part1) (part2) (part3)
Performance Tips when creating WP7 apps
Windows Phone 7 Live Tile Schedules – How to execute instant Live Tile updates
Tips to get your Application in the Windows Phone 7 Marketplace ASAP
Checking for Network connectivity in Windows Phone 7 SDK
Windows Phone 7.1: a Quick Start
A Simple Multi-Page Windows Phone 7 Phonegap Example
Books
Programming Windows Phone 7
Professional Windows Phone 7 Application Development
Pro Windows Phone 7 Development
Beginning Windows Phone 7 Development
Learning Windows Phone Programming
Windows Phone 7 Game Development
Windows Phone 7 Application Development
101 Windows Phone 7 Apps, Volume I: Developing Apps 1-50
101 Windows Phone 7 Apps, Volume II: Developing Apps 51-101 (Fall 2011)
Podcasts
Charlie Kindel on Windows Phone 7
Daniel Egan talks Windows Phone 7 Live at Launch
Windows Phone 7 Series - The Developer Experience with Charlie Kindel
Charles Petzold on Windows Phone 7 Series
Videos
Windows Phone 7 Jump Start sessions
Colin Melia on Windows Phone 7
Channel9 Content for WIndows Phone
Developer Tools
8 Must-Have Tools for Windows Phone 7 Development
Windows Phone Developer Tools RTW
EQATEC Profiler for Windows Phone 7
BugSense, bug tracking for Windows Phone 7
Frameworks
OpenNETCF.IoC Framework
Autofac for WP7
Microsoft Silverlight Analytics Framework
MVVM Light Toolkit
Columbus: Windows Phone 7 MVC framework
Windows Phone MVP
Caliburn.Micro - MVVM framework strongly based on conventions
Windows Phone 7 Jumpstart Training
Training (Video and PDF) includes: