There are some really cool new capabilities for smart device development in Visual Studio 2005. This is one area of Whidbey that I've barely touched up until now, but I've just been wowed by the breadth and range of improvements. For example:
The TechEd session that will show most of this off is MBL332, "Visual Studio 2005 Development for Smart Devices". This session will be presented at both TechEd US and TechEd Europe. This one should be high up on your shortlist - you'll be impressed, I promise you!