Good news to developers. Sony Ericsson just announced an update to their Windows Mobile 6.1 SDK (now v1.0.4). It now adds development compatibility to Microsoft Visual Studio 2008 and to Microsoft Vista.

The Sony Ericsson Beta SDK for Windows Mobile 6.1 includes:

• Xperia X1 Emulator
  Including key mapping support; run, test, and debug your Xperia Panels locally on your PC using the Xperia X1 Device Emulator
• API Reference
  API reference documentation related to the specifics of developing Xperia Panels
• Microsoft Visual Studio Templates
  Use predefined Xperia Native and Web (HTML) Panel templates to create the basic project containers and a preliminary set of items for your Xperia Panels
• Tutorials
  Tutorials give you a “hands-on” introduction to the SDK and the tools you use to build applications on it
• Developers’ Guidelines
  The Getting Started documentation includes overviews, system requirements, set-up information, and walkthroughs that help you learn about the Sony Ericsson Beta SDK for Windows Mobile 6.1
• Sample Code
  The Sony Ericsson Beta SDK for Windows Mobile 6.1 ships with several sample projects to help you start your own development projects

Download the SDK now.

[Thanks boomdijk!]