Insert gadgets into your site
To easily embed rich media, retrieve feeds, or perform simple tasks like managing a to-do list, you can insert gadgets into your Google site. Click the Edit page button on the top right corner of your window, select Insert, and choose one of the gadgets in the menu.
For example, insert the Recent posts gadget to display the announcements posted to the site, or the Recently updated files gadget to show recent files. To view gadgets created by third-party sites, click More gadgets... and a window appears.
From this window, click the links on the left side or type in the search box, select a gadget, and click OK to select the type of gadget you want to insert. If you'd like to first check how the gadget looks in your Google site, click Preview Gadget first.