I had thought that Blend 4 was supposed to have included VS 2010 templates (for custom behaviors, etc). I have both tools installed, but I do not see the templates in Visual Studio. Is there something I need to do to install them?
The templates for that are included as part of the Blend SDK. The code for Behaviors, Triggers, etc. is also part of the SDK so you'll definitely need to install it if you want to use those classes. I did some poking around and it looks like those Templates are only available from Blend, not Visual Studio (weird).