OK, so not a personality test, but since MMPI-2 really isn't either, I figured I'd give the ling here:
20 - 49 points: You are an average on-line user. You may surf the Web a bit too long at times, but you have control over your usage.
50 -79 points: You are experiencing occasional or frequent problems because of the Internet. You should consider their full impact on your life.
80 - 100 points: Your Internet usage is causing significant problems in your life. You should evaluate the impact of the Internet on your life and address the problems directly caused by your Internet usage.
My score was 36.