flakk:
What are some good ways to make maps? Especially gridded ones?
I use a image editing program called Paint.Net
It's a free download and is pretty decent by itself. It's also got a fair (large?) number of user created addons, including one that I use for making grids. My method is to usually create three layers in the image, one for the terrain and characters, one for the grid, and one to shroud what the players can't actually see. Probably more work than I need, but it seems to work well. I then save the image as two files, one as the paint.net file which preserves the laters (for easier editting) and the second as a jpeg for ease of sharing with the players.
If anyone is interested, I can share the links for the program and the grid add on I use.