It is fairly interesting to meet all the requirements.
One nice thing is that the regulations do not start to apply until the second day (this means you can buy chicks ANYWHERE as long as you raise them organically)
We've got 14 blue andelusian hens (+4 roosters [they gave us extra]) that we are raising organically.
One thing to point out is that under a certain threshold ($5000) you do NOT have to pay someone to officially certify you. You can legally call the chickens/eggs organic, but you can't actually use the green white logo on your packaging (because it reads CERTIFIED organic).
Even if you do not have to certify you DO still have to meet the program requirements.
The biggest is that ALL (and that means ALL) food must be certified organic.
No meds
They must have access to the outside.
All land they have access to MUST meet organic requirements as well (3 year no spray).
Another gotcha that you need to watch is pressure treated wood. They can not have any access to treated wood. We bought a shed to convert but had to cover all the interior walls/floor and keep the chickens away from the outside also.
While it is true that if you plant it must be organic seed that does not mean that you must replant anything. The three year transitional period "grandfathers" the existing ground cover.
http://www.attra.org/attra-pub/organicpoultry.html is a good resource
The land requirement is the biggest reason our chickens are in our fenced yard area, which has been organic for 8 years. The main part of the farm was being used by family that did not follow organic standards so we can't use it for two more years.