The Nerd Machine is a little site headed up by Chuck star Zac Levi. He claims that it will be the site for all things "Nerd". Currently, they have several t-shirts available, but you'll apparently have to wait for the real nerd stuff a little longer.
The Machine t-shirt design resurrects "the pile of classic gaming systems, stereos, and hard drives stacked in our closet". Available in black and green for men and white for women, you can show off your nerdiness for $25.00.