The map editor for the (as of yet unnamed) RPG is now online.  You have the ability to create your own maps, add your own tiles, and I've added the much needed "Eraser" function.
Remember, new tiles are resized to 48x48 pixels (if they aren't already), and map sizes are measured in tiles.
http://darkshade.homeip.net/rpgeditor/
Enjoy making maps for the upcoming game!  There's still more features to add to the editor, but there's enough functionality there to get us started.

HUGE import of tiles tonight.  There are now 483 tiles to use for map making, and I've only added about half of the ones I've got available.  (Yes, it's pretty monotonous!)  I gave up trying to uniquely name them, and just started using numbers.  Several numbers will repeat, as there were three batches of tiles to add.