As many of you know OpenSocial gadgets make it easier to integrate with other applications on the web and behind the firewall. Along with many other new features it is now possible to embed OpenSocial gadgets on any Confluence wiki page. This will let groups of people collaborate around gadget content from virtually any application seamlessly.

* Embedding OpenSocial Gadgets is Easy - Confluence 3.1 lets you embed Gadgets from other Atlassian tools like JIRA, Bamboo and FishEye directly into Confluence pages. You can add and configure gadgets in just a couple clicks using the Macro Browser, a visual editor available from any page.And because OpenSocial is an open standard, you can use Gadgets to integrate with 3rd party applications behind the firewall and thousands of applications on the web.
* Add Confluence to other applications - Confluence also provides its own Gadgets that you can embed into other OpenSocial containers like JIRA or even Gmail. Confluence comes with three out-of-the-box gadgets: Activity Stream, QuickNav and Confluence News.
Source:http://blog.opensocial.org/2009/12/collaborate-around-opensocial-gadget.html