Elevation Profile
Now I think that this is pretty cool! I made two elevation profiles of elevation.dem (from the spearfish dataset). The top profile line runs from the NE to the SW on the display. The second profile line (B) runs along the N edge of the area, from E to W. This is super easy to do in GRASS (even for someone who knows nothing!

Photo album generated by album from Dave's MarginalHacks on Fri Oct 3 23:38:50 2003