This tutorial shows you how to build a very efficient, fully automated but fairly cheap and simple pumkin / melon farm.
The redstone budswitch requires comperators so you need access to the nether for quartz. This automatic pumkin and melon farm design is a little bit more efficient than previous designs at a cheaper cost of ressources.

--- worldfile download ---
http://www.mediafire.com/?hmhthbbtmlubqj4

--- used music ----
"Silvermoon (2006) Cyra Elia / Bluejooz" by bluejooz
http://soundcloud.com/bluejooz/silvermoon-2006-cyra-elia
CC-BY http://creativecommons.org/licenses/by/3.0/