title: using mutliple drawables on a mapview
body: <p>I have very limited experience with Mapview, Overlay and ItemizedOverlay.  I've seen some simple code examples that use one drawable for overlays and itemizedOverlays but I'm unsure how to approach these requirements:  I want more than one drawable on my  map view (example: a star-icon for the map center and some other icon for other overlay items) but I want one to be unclickable (the star).  Should I use both Overlay and ItemizedOverlay to achieve this?  </p>
  
  <p>Also, my next problem is a matter of presentation:  If I have 500 items to display on a map, what is a practical way of displaying that information?  Again, I have little experience developing and using map applications.</p>