Channel 9 (a.k.a. five guys at Microsoft) has released a Developer's Training Kit for Windows Phone 7 Series. The Training Kit is designed to give you a jumpstart into the new operating system.

The training kit includes three units covering the WP7S platform, Silverlight for Windows Phones and XNA Framework 4.0 for Windows Phones.

According to Channel 9 the training kit is geared for the beginners who want to get started with developing applications for the Windows Phone 7 Series.  Experienced application developers should find the training kit useful in that the Silverlight unit focuses in part the differences between Silverlight and Silverlight for the Windows Phone.

You can find the Windows Phone 7 Series Training kit here with each course unit being a separate download.