Currently Google provides Web Elements widgets for the following eight products:
The new Web Elements widgets essentially provide an easy way for non-technical users to leverage numerous Google APIs to rapidly create mini-mashups. Although the code for the widgets is not accessible to developers, the widgets themselves can be styled via custom CSS.
Although this class of widget is not completely new, it is good to see this new offering as an alternative means for users to integrate and disseminate Google's web applications. It will be interesting to see whether Google expands the applications available as Web Elements as well as whether features and functionality can be customized.