Here's a live example of a Wave-enabled widget, and a screenshot of using these in Moodle in place of blocks.
http://zope.cetis.ac.uk/members/scott/blogview?entry=20090601115357
More shots of Moodle using Widgets and OpenSocial here:
http://zope.cetis.ac.uk/members/scott/blogview?entry=20090227190013
Any questions about how its done, just ask!
Cheers,
Scott