Tag listener interface - This would make it simple to add 
new tags that Javadoc doesn't know about.  All you would
have to do is write a listener class that tells how to 
deal with the new tag.   (Suggested by Steve Lewis, who
gave the Warnlet/Codelet BOF.)

56% of developers at '99 JavaOne Javadoc Bird of a Feather
voted for this -- the most highly rated request.

N/A

Very worthwhile.  We need to flush this out a bit, then informally pass 
this by the TRC to see if they have any objections.
  xxxxx@xxxxx   2000-12-06

Also see related RFE  
4359470  Modify Comment.java for easy writing of custom tags
  xxxxx@xxxxx   2001-06-21