Nokia’s WidSets is a widget kind of thing for your java enabled mobile phone. A bit like the OS X dashboard but on your phone. If this breaks through it can get huge as it makes it really simply to extend a web application to the mobile. All it takes is a web api. A really useful already existing widget is the Ta-da list widget which connects with Ta-da list.
One interesting thing is that you set it up with your web browser and then you’re happy with your widget setup you sync it to your mobile phone. By doing it this way they got rid of the usually horrible job of configuring the application on your mobile phone with the minature screen and the tiny keypad and it also makes the application on the phone a lot less complex and much smaller.