With the new Mango changes and apparent 500+ API changes, including support for multi-tasking, there is one thing you can do to your app that’s a simple change of just 3 lines of code and it will make your users love you just that little bit more.
In your App.xaml.cs, go to your Application_Activated handler, if you have code already in there for reinstating your state after tombstoning, wrap it all up in this:
if (!e.IsApplicationInstancePreserved) { // Code to reinstate the application's state }
Do this and your users will experience a quick reload of apps if they switch back to it from the multi-tasking switcher.
SL