I agree that there should be some way to differentiate a finished (or atleast in some complete iteration, a project should never truely be "finished," revisions are natural) project. The stickied topic with links to projects does not seem to do the trick.
This may be going too far, but I think there should be sub-sections of this MB for each major game. Things start here and when a game has enough going for it, it gets its own SECTION. In there, completed projects are stickied. Major updates are announced in the main section. This is just one way to address the issue, but I think something needs to be done.
Also, it would be nice if there was a separate thread for comments or something. They really gum up the whole process sometimes, pages and pages of "that's teh pwnage Djipi" does not help the casual visitor, or anyone trying to look over progress, for that matter.