Widget Library for Windows Phone 7 allows you to build applications for Windows Phone 7 in an easy way using your existing skills on HTML, CSS, and Javascript. The library allows you to create apps over the WebBrowser control on Windows Phone 7 platform.

Clint Rutkas, the handyman at Coding4Fun on Channel 9 has developed and released the Coding4Fun Windows Phone Toolkit. The toolkit is a set of Silverlight controls, converters, and helpers to make your life easier.

Mango, codename for the next version of Windows Phone shipping later this year, offers a lot of new capabilities for developers to create even better, more immersive user experiences on Windows Phone. This training course by Microsoft will give you hands-on experience with important developer features in Mango.

Avlade has published a useful eBook – Designing for Windows Phone 7 – which includes great content weather you are learning Windows Phone 7 development or training/speaking on the same. Avlade is a content creation and sales enablement partner for technology companies.

The Application Bar, the quick and easy toolbar for your application, is displayed as a row of between one and four icon buttons along the bottom of the phone’s screen. The icon buttons are used to provide users with quick access to an application’s most common tasks.