First let me say, I love it.  Looks good, behaves good, wonderful.

Anyway I had a few thoughts for inclusions in future versions
I don't know whether it's planned or not, but animated characters, even the simple chess characters could be animated.
A possible move indicator which shows me just by mousing over any piece (including the opponents) what possible moves they have.  This would also be good for helping people learn the game.
I know that this is kinda cheating, but how 'bout an undo feature.
And perhaps (in the distant future) a piece editor.  Simple little 3d editor which will edit and create new pieces.  Or even just edit existing ones.

Oh and a place on the website where the future plans are listed, and people could suggest new ideas or vote for their favorites.

That said, great program, absolutely wonderful.