This EXcel sheet that calculates the flattened (unfolded) shapes for cones, spheres, truncated cones, domes, etc. It is self explanatory. If you need help with it, you can always post a question. Thanks to "scyeige" for giving us the EXCEL sheet to upload. It can be found here:
http://www.zealot.com/forum/downloads.php?do=file&id=1645
http://www.zealot.com/forum/downloads.php?do=file&id=1645