One of the cool new features of Windows Mobile 6.5 is its support for widgets. The Windows Mobile team has a blog post set up on getting started with your own widgets.
You'll need the WinMo 6.5 emulator images, the development environment of your choosing and Windows Mobile Device Center (Vista) or ActiveSync (XP) to get started. The rest of the instructions are at the blog post. Get cranking on those widgets!
Getting Started With Widgets on Windows Mobile 6.5
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