The Creation of permalink
  I saw it sometimes when a plugin writer directly construct a permalink (also called item link) by doing this:
          ... ... echo "<a href=\"index.php?itemid=".$itemid."\">".$title."</a>";
... ...
Admun's NUDN now FancyURLed
  Today, I learnt about a trick how to put a 2nd blog on its own dirs. 
see here
Some links still broken because nudn/nudn is in the link instead of nudn/... still working on it. Now, all is working.
  
 
see here