todo

   1 bug - proper scaling (with anti-aliasing)
   2
   3 feature - undo
   4 ui - search ui
   5
   6 visualization - calendar view - http://flickr.com/explore/interesting/2007/07/
   7 visualization - mosaic view   - http://www.coverpop.com/pop/indie/
   8 visualization - calendar agenda view - eg like normal except add
   9
  10 =======
  11 feature - support drag and drop into bookmarkbar/...