The Urban Hens Project is meant to develop a sustainable, closed-loop model for establishing chickens in urban settings. Hens provide eggs, they eat kitchen and garden scraps, and if you're really hard core, they'll become a fine little dinner. Check out these modern, Quonset hut-inspired chicken coops.
I love the idea of urban agriculture, but I can also imagine the potential for neighourhood relations to be strained by the crowing of someone's rooster at the crack of dawn. Aha... Treehugger notes that most urban bylaws only allow hens as roosters are considered too noisy.
See also the 'iPod of the chicken coop': the Omlet Eglu.
(Via Jetson Green.)