Instructables
This instructable is pretty simple anybody can do it I just thought I would post my attempt.

To start just print out the picture in the link below
http://www.thinkgeek.com/images/blog/2010pumpkin-41.jpg

next gut the pumpkin. :P

finally tape the picture on to the pumpkin and start cutting out the white parts

That's about it
You want to be careful not to cut the to big or else the piece that divides it will fall off like mine.