The XNA Team made the announcement that XNA Game Studio 2.0 has been released. The Net Rumble starter kit is a good place to see the most anticipated added feature of networking in place.
Some tips if you try to upgrade any of your 1.0 code to 2.0:
1. Make sure you have the Project Upgrade Wizard installed.
2. If you have sound in your project, you will want to open the project with the new XACT tool and then save it under the newer version.
3. If you use Render Targets you should read this local help page.
4. This doesn't require immediate change, but the LoadGraphicsContent and UnloadGraphicsContent methods are now obsolete. LoadContent and UnloadContent should be used instead. Shawn has an excellent post about this.
In general, read this local help page (available after installing XNA Game Studio 2.0).