Lefty: Thank you for correcting me on my use of "NPN." I'm about 2-3 months into electronics and almost a month into Arduino. I clearly have a lot to learn. There are no electronics classes at my high school so I'm doing everything on my own. It's really cool to show successful projects to my teachers because they are in awe, but it's a huge pain in the ass when I need help because no one there knows enough to help me out. 
As far as my schematic goes, is this correct? http://www.flickr.com/photos/brandondub/8428978072/in/photostream
Also, probably an idiotic question: I don't need a pull down resistor on the gate here because the Arduino will write LOW when told so, but if I was just using an SPST switch it would need an in-circuit pulldown, correct?