How about changing the default Anonymous Coward. I suggest Mysterious Ones....or Strange Rangers....or Covert Posters.
Also, how about a feature that permits pictures to be downloaded into a posters thread such as images from SOHO or pictures of ufos or fireballs. That way everyone can view them right on the thread instead of having to transfer to another site.
And, how about automatic update of the forum's main page whenever we "return to forum" so it isn't necessary to refresh the page everytime we return from one of the threads.
Even if no more features are added, though, this forum is unbeatable.