Things that you will need that are not on the parts list

-A power source (7.2 - 24V DC)

You could use a lead acid battery, a NIHM battery pack, or a 12V lithium ion battery pack.

-Appropriate cables to connect your camera to the JSR Intervalometer:

If you have the standard 2.5mm remote port of most entry level Canon Cameras, you will need a simple 3.5mm to 2.5 mm cable:

If your camera has the N3 connector (50D, 7D, 5D ect.) you will also need an adapter:

To connect your flash port to the JSR for bulb ramping, you will need a PC sync flash cable to 3.5mm audio jack:

If the PC sync cable is rather short, you will probably also require a 3.5mm to 3.5mm extension cable:

 If your camera does not have a built in PC sync flash port, you will require an adapter that goes on the hot shoe: