I got my Tagger King badge this last Friday.  Slightly past 800 tags so far and I don't intend to stop now.  I find myself wondering if a badge higher than King will be created.  Tagger Emperor, or Tagger God for 2000 or more tags or something.  What is the point of continuing to list and tag if extreme numbers don't receive recognition.  I have read in the forums that the King badge is supposed to be extremely difficult to earn and over 1000 unique tags are needed, but I have found neither to be completely true.  The most tags I have seen in another's profile exceeded 1500.  It is so easy to do and the Tagger badges are cool in the graffiti kind of way.