Freesweep now supports exporting an image of the current board status in PPM format. The image represents unexplored space with black, empty spaces with white, and known mines with blue. There is also a set of red crosshairs placed over the current cursor location.

To generate an image, press 'i' during play. At present, the file will always be named 'foo.ppm', but soon this will be configurable.

Here's a 1024x1024 board I've been playing for months. Click the small version below to see the full-sized map.
[ small sample image ]