I pasted an image of a grid map into a Word document and then used the shapes and lines in Word to 'draw' over the grid map creating walls, terrain, etc. Then i have little shapes to represent the characters and npcs. I attach the document to a post. The player who's turn it is will open the document, move his marker and then save and re-attach the document for the next person. Seems to work and is easy, doesn't look as bad as it sounds and no one has to download anything funky.