Jeff and I were talking about how we'd like to have a Twitter T-shirt on the way back from Codemash in the car. I decided to find one tonight and quickly landed at http://www.reactee.com. A few minutes later and I had my shirt on order.
Making one isn't hard. There are five options to select and several colors. While I chose black as my color I thought about the light blue since that is closer to Twitter's brand but ultimately decided the light blue was a little more feminine than I was willing to wear in public. For those that use Paypal and Google checkout the site supports both.