An interesting paper published recently talks about the experimental demonstration of a (primitive) logic gate.
Reference: Roman Sordan, Floriano Traversi, and Valeria Russo, “Logic gates with a single graphene transistor,” Appl. Phys. Lett. 94, 073305 (2009) (3 pages)
#1 by Roman Sordan at April 21st, 2009
You might find this one even more interesting:
http://arxiv.org/abs/0904.2745
#2 by Raghu at April 21st, 2009
Thanks for the link…very intelligent use of electrical annealing to shift the Dirac point. This is the first demonstration of a graphene inverter.