Torx T8 & T10 Screwdrivers -
The console is held together with Torx screws, these screwdrivers are easy to find and quite cheap. If you are hoping to open a Xbox 360 controller, you will need a Security Torx T8H. The best ones I've found are from Llamma's Tool Section
.Small Flathead Screwdrivers/Paper Clips -
Used to hold open the friction locks of the 360 front cover. You can also use paper clips if you desire.360 Opening Tool ($7 - Optional) -
This is a specialty part used to pop the rear locks and remove the heating grills. This is worth the $7 pricetag found at Llamma's tools if you open systems repeatedly. Another option for an opening tool is a small flat-head screwdriver, you will have to pop each friction lock one at a time, but almost everybody has a satisfactory screwdriver. Removing the shell gets frustrating and tiresome if you open lots of boxes, but if you don't feel like spending $7+s/h and waiting a week for a tool you will only use twice, don't bother with the Llamma tool.