I didn't see an Instructable about how to replace the DS shell so I decided I'd write one up. It's a pretty complicated process and took me about 3 hours to complete, so I figured that a lot of pictures and descriptions of the process would help others. I labeled each section to make it easier to find a specific part of the process.
You WILL need a tri-wing screwdriver for the replacement so either get one off of ebay or if you place an order with dealextreme.com, add one to your order. You will also need a small phillip's head screwdriver, a flathead screwdriver, an exacto knife, a soldering iron, some de-soldering braid or solder sucker, and possibly some needle nose pliers.
When taking your DS apart, pay attention to how everything fits. Don't just rip it apart, take notes if you need to. It really helps in the end. When you put the DS back together, the hole will probably not be threaded so it may take some force to get them in there.