Potential fix for:

http://code.google.com/p/reviewboard/issues/detail?id=106&sort=priority&colspec=ID%20Type%20Status%20Priority%20Component%20Owner%20Summary%20Milestone
    
Visual indicator in the dashboard, per review, of your commentary status.
    
Uses the existing comment tag icons to represent the following states:
* no icon:  no comments
* blue (published): you've published comments and have no drafts waiting
* green (draft): you have at least one draft comment; this trumps published state

I've banged on it a bit, haven't found anything busted yet.