The APIs stuff is just making life easier.
Gadgets are like small applications we play with at different platforms.
Google already have gadgets platform available at iGoogle. Now google introduced Gadget Ads for Adwords. Now you can have more interactive ad campaigns with gadget ads.
Google gives a lot of AJAX solutions through AJAX APIs that the developers love to use. APIs need a little attention to be implemented.
How do you believe and get courage of using new things until and unless you have a live visual demo of that.