As you probably know the MIX10 is currently going on in Vegas and it's presentations are available online which have a lot of very useful information about WP7 development:

http://live.visitmix.com/Videos

Such as:

Building Windows Phone Applications with Silverlight, Part 1

Building Windows Phone Applications with Silverlight, Part 2

Development and Debugging Tools for Building XNA Games for Windows Phone

Silverlight Performance on Windows Phone

Unit Testing Silverlight and Windows Phone Applications

Also, as you know the panoramic control for creating a "hub like" UI is not available yet, but people have already started coming up with thier custom implementations. For example this one:

http://aimeegurl.com/2010/03/18/panoramic-navigation-on-windows-phone-7-with-no-code/