Showing off what you gave sweetens the giving. Also, once a person has given, would be interesting to see others who gave to same cause, or else details publicly available upon giver and cause's configuration.

You can follow me on friend feed here: http://friendfeed.com/ikirigin

We have a more complex feed that FriendFeed isn't using. It shows the other public tippers. You can see my complex feed here: http://tipjoy.com/userstream/ivankirigin/?feed