"Organic" has some quite specific legal definitions in most developed countries.
In U.S, all farms or products claiming to be "certified organic" must be guaranteed by a USDA-approved independent agency to be meeting following guidelines:
* Sound records kept of all operations * No use of antibiotics or hormones in livestock * No use of genetically modified organisms * No irradiation * Use sound soil conservation and crop rotation practice * And most importantly, that there has been no useage of prohibited materials within 3 years prior to certification, or at any time during certification.
The USDA defines 'prohibited materials' as synthetic fertilizers, pesticides and sewage sludge. It is also a requirement that there is no cross-contamination during processing, which means organic wheat for example cannot be ground in a flour factory that also handles non-organic material.
Produce grown organically certainly tastes better than usual supermarket stock. It also contains higher levels of nutrients and far lower residual pesticides. You can read all latest Organic Food articles and research at http://www.ge-free.com/