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Xanga has teamed up with Widgetbox and Clearspring to offer users a widget gallery for the inclusion of lots of fun widgets on their Xanga pages. While this is all fine and dandy, the important takeaway here is the fact that these new widgets work with Xanga Themes.
Since the conversion to Xanga Themes, a lot of third party widgets haven't been working on Xanga, so the provision of this widget gallery is in part to appease those that no longer have working widgets, and to buy Xanga some more time while it works on a way to support more widgets within Xanga Themes.