#963422: Port Activity Stream to Drupal 7? in a sandbox.
I threw this sandbox up because there wasn't much response happening in #963422: Port Activity Stream to Drupal 7? and I was considering using ActivityStream at the time. Since then I've not been using the module, and I'd be happy for someone who is engaged in the D7 port to take ownership of the sandbox.
Please use the ActivityStream issue queue.