The widget/gadget scene is starting to offer many options for developers:

Yahoo! Widgets - now fully rebranded with version 3.0 and no longer called Konfabulator. [developer reference]
Dashboard Widgets (Mac) - considered a Konfabulator copycat by non Mac users mostly, but tons of cool widgets
Microsoft Gadgets - Microsoft’s entry to supplement live.com, skipping the widget name
Google Homepage Modules - Google doesn’t like the widget name either, and offers up “modules” for users to be able to customize their own Google Homepage.

I’ve only created a widget for one of these (a game), but am curious about adapting it to these other widget/gadget platforms if for no other reason than learning how their system works. I found Google’s Homepage system fairly straightforward to work with. I’ve looked over Microsoft Gadgets a little bit and Dashboard Widgets on the Mac. I run v2.0 of Konfabulator/Yahoo Widgets on the Tablet but don’t use it very much. The only widgets I regularly use are on the Mac. Something about hitting that F12 key to get the things I’m most interested in popping up that I like.

How many of you are using widgets/gadgets/modules and if so what are you using them for? Fun & games, stats, productivity, site promotion?