From the ThyroidManager:
Chapter 20. The Iodine Deficiency Disorders
http://www.thyroidmanager.org/Chapter20/20-frame.htm
Lots there. Scroll down to darker print headings for more specif disorders.
International Council for the Control of Iodine Deficiency Disorders
http://www.iccidd.org/
See what's happening around the world as well as where you live. Includes good map.
Iodine-Induced hypothyroidism.
http://www.ncbi.nlm.nih.gov/pubmed/11396709
study at PubMed , includes basic info concerning both hyper and hypo.
The Iodine Controversy Too Much vs. Not Enough, and What It Does To Your Thyroid?
http://thyroid.about.com/od/newscontroversies/a/toomuchiodine.htm
at About.com, with more articles linked at the bottom of the page.
Search at Elaine Moore's site.
http://www.elaine-moore.com/SearchResults/tabid/37/Default.aspx?Search=iodine
Wow.. there's more than I remember !
http://www.cc.nih.gov/ccc/patient_education/pepubs/lo_ioi_list.pdf