Since I find myself using a common bag of goodies for WP7 development I thought I’d start listing them here.
AgFX* (although using in conjunction with MVVM light you may find grating since concept of view model and model is a bit blurred although still blendable using the Sample Data approach).
Windows Phone Toolkit
Jump List Control
(although you should follow the suggestion in one of the follow up posts if you get an “unspecified error” because it doesn’t look as though Colin has updated the code).
* Also available on NuGET
Other stuff I want to look at but haven’t had a chance yet
WP7 Contrib – Caching, Messaging, Communciations, Services, Diagnostics and a bringing together of some good public WP7 controls.