Today the Windows Phone team released the final bits for Windows Phone 7! The tooling is free and will integrate with Visual Studio 2010 and Expression Blend 4 if you have them installed as well. Head over to https://www.microsoft.com/downloads/en/details.aspx?FamilyID=04704acf-a63a-4f97-952c-8b51b34b00ce to get the RTM tooling.
Here is also a little list I’ve been keeping with useful controls around the internet!
Silverlight Tool kit
Picker (Combo box)
More Complex splash screen
Great list of resources
Detect if a listbox is done scrolling
Pass data between pages
relative date time converter