David Hewlett was pondering whether he was a nerd or a geek on stage at the Vancouver con, and someone in the audience called out, "There's a chart for that -- nerd, geek, or dork!" He responded, "If you know there's a chart, then you're all 3!"
Apparently he found the chart (according to his Twitter posts):
http://www.neatorama.com/2009/09/16/are-you-a-nerd-dork-geek-or-dweeb/ I'm not sure I'd be so quick to label myself a nerd ;-D