To-Do List (aka "Things I have in Mind for Upcoming Releases")
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- system-wide high score list (the current high score list is unique to
  each user on the system).  This is actually non-trivial because (a) it
  introduces permission issues and (b) it will significantly complicate
  the installation script (probably it will be necessary to override
  some distutils classes to pull it off properly).

- pop up point subtotals for some of the more impressive combos

- jool disappearance animation

- improved jool swapping animation.  Try playing around with a 3D look,
  in which one jool appears to move closer to the user while the other
  appears to move farther away.  Not a priority, but it may look cool.

- decrease probability that new falling jools will have two or more of
  the same color

- multiple resolution choices, maybe a fullscreen mode

- better artwork (help!), music (help!)

- bonus rounds of some sort

- user option: rotate tracks rather than continuous looping of music

- user option: remove green selection square that is currently displayed
               on mouseover

- if there is only one track in the playlist, continue playing
  uninterrupted when a new level is reached

- online help

- consider indicating selections with only the corners of a square,
  rather than the complete square