when your on the overview tab for a given workspace, look in the "Workspace Information" widget.
There is a link to an RSS feed of everything going on with that workspace.
Now right now, it will only give you a title, and if you click on the title it will launch openGoo prompting a login.. so this isn't a good solution to give to clients...
I wouldn't mind a version to "hand out" so to speak, that would not have any links in it to openGoo, but would include any descriptive text associated with the action that was logged.