Added some more comments to the sample config.

sample_config.py

@@ -1,15 +1,18 @@
 # This is a sample config file, meant to give you an idea of how to format your
 # config file and what's possible.
 
-# Define the path to your world here
+# Define the path to your world here. 'My World' in this case will show up as
+# the world name on the map interface. If you change it, be sure to also change
+# the referenced world names in the render definitions below.
 worlds['My World'] = "/path/to/your/world"
 
-# Define where to put the output here
+# Define where to put the output here.
 outputdir = "/tmp/test_render"
 
 # This is an item usually specified in a renders dictionary below, but if you
 # set it here like this, it becomes the default for all renders that don't
 # define it.
+# Try "smooth_lighting" for even better looking maps!
 rendermode = "lighting"
 
 renders["render1"] = {
@@ -17,12 +20,14 @@ renders["render1"] = {
         'title': 'A regular render',
 }
 
+# This example is the same as above, but rotated
 renders["render2"] = {
         'world': 'My World',
         'northdirection': 'upper-right',
         'title': 'Upper-right north direction',
 }
 
+# Here's how to do a nighttime render. Also try "smooth_night" instead of "night"
 renders["render3"] = {
         'world': 'My World',
         'title': 'Nighttime',