Here's something a lazy or pressed for time DM might find useful - using the free image editing software GIMP, you can make a fairly decent world map in seconds. I discovered this by accident today while working up a logo from the Create submenu...
Step 1: Create the land.
Change the size and experiment with the random seed and elevations.
Optional Step 2: Add a square or hex grid overlay. GIMP comes with the square grid pattern already installed.
If you'd like to use a hex grid, you'll first have to install an additional script. An example of finished output is below, an example with square grid rendering is here.
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