This is just a quick update to show the new tile map rendering code.  I am however about to undertake a rather large change, in that I will switch from SDL to DirectX for all of my rendering tasks.  Hopefully this will not be a noticeable change since I will keep the same pixel perfect 2D style, however it will all be running on the graphics card, thus also allowing the use of some nice shader effects, transparency, stenciling, etc.