Write a widget once and run it on every device that provides a widget runtime - that´s the idea. Here at Vodafone, we test widgets on a lot of different platforms. When it comes to testing on devices with a very high resolution display, we often encounter widgets that look like this one:

Fonts are too [...]

There are three really useful tools for testing your mobile widgets:
1. Forum Nokia Remote Device Access
2. DeviceAnywhere
3. Adobe Device Central
Forum Nokia Remote Device Access
This tool allows you to check your mobile widget across a large number of Nokia devices, all for free. You can reserve time on any Nokia device to test your application and [...]

Although widgets are built from the same technology that you use to build websites, you need to remember that they’re used on a mobile device that has certain limitations and difficulties. Make sure to keep the following in mind when designing and building your widget:

Provide a loading screen if necessary
Clearly state the purpose and benefit [...]

I’ve just picked my top three picks for the £20,000 widget prize so I’d like to share three tips for making a really great mobile widget:
Make sure it’s mobile
Your widget will be used when someone is on the move, so it should match that use-case. If it’s not something people would use while they’re on [...]

You may have noticed that some widgets, while being minimized, display some piece of information on the Vodafone Apps Manager home screen. For example the pre-installed Weather Bug widget displays the current temperature of the set location, and the pre-installed Clock widget displays the current time. This is possible because the Vodafone Apps Manager runtime [...]

Peter-Paul Koch over at QuirksBlog has written a great post about mobile widgets, including some of the ins and outs of developing for the different widget platforms currently out there. Quoth PPK: “Personally I firmly believe that widgets are the future of the mobile web.” We couldn’t agree more!