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

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/