I have been using them for the following applications: Slide-show of blog-posts from an RSS feed (widgetbox.com); blidgets (convert a blog into a nice snippet: e.g. This blog's blidget on ruthvickdivecha.com's sidebar)
The cool advantage is - once the widget is placed on your webpage or blog, you can infinitely tinker and tweak from the widget-building website, in my case widgetbox.com
And did I mention that it is free? Coooool, infinitely.
formlogix even allows you to analyze data submitted via its form using tables, charts etc. Also, the form creator is Wysiwyg: and it rocks!
Widgets have cut my development life-cycle time by 90% (without learning a new language, switching to a new platform or hiring a developer). They help me create reliable, robust and flexible web components which I can tweak to my heart's wishes. If you are a busy web professional: widgets will be the next best thing after sliced macaroni... ok, ok sliced bread.
