The best way that I think to get information about coops is reading some books. There are a lot more chicken books out there than you would think. One of my favorites is "A Guide to Raising Chickens" by Gail Damerow.
Here is the small coop. This was our first coop. Now we use it to hold babies and new chickens.
Same as above, except with door open. This coop has a wire mesh bottom, so the manure falls to the ground. There are roosts in the top. There are two doors, a large one for us to see the chickens, and a small one so the chickens can come and go during the day. Has a slanted roof. A mesh window is in the top, to give the chickens air.
This is our main coop. It's very NICE!! I don't know what I would do if my dad was not a builder. :-) It's insulated and everything. The chickens like to lay under it when it gets hot outside. There is a chicken wire fence around it, but I wanted to point out that this has no use. We have an electric fence that keeps out the predators. We let our chickens roam the yard.
Here is our main coop again. This is when we were just building it. The coop is held up by concrete blocks. The coop has nest boxes in on side, and roosts in the other. A door for us, and a door for the chickens. We take the window out during the summer and put mesh in, to let air through.