I was playing around with the Android Widget API over the weekend and so far I am quite impressed. It's easy to use and very powerful. I already have tons of ideas for things I would like to build. There's a relatively easy tutorial on the Android Developers blog but I preferred learning by browsing the source code of their 'Word of the Day' demo.

As an example I built a simple widget addition to my weather application which shows the current London temperate in Celsius on my home screen.

I do have some concerns though. When waking the phone up from a long period of inactivity and then changing the screen orientation a few times the Home screen hung on me and I had to reboot to resolve the issue. This may be bad 3rd party code but it's definitely a problem.

Also, be sure to check out Enrique's blog post about Android widgets; the video is great.