Gadgets, like widgets, are mini-applications that typically provide useful information or perform very simple desktop functionality. However, unlike widgets, they do not require a widget enabling program (i.e. such as Konfabulator, DesktopX Standard, Kapsules, etc.). They are stand-alone programs requiring on additional downloads.

These gadgets will be in Windows VISTA.

http://microsoftgadgets.com/default.aspx