This is a list of places to visit for general and specific breastfeeding support. All of them come from the ToolKit (p. 479) in the newest Womanly Art of Breastfeeding:
 
La Leche League International http://www.llli.org/
American Academy of Pediatrics Breastfeeding Policy Statement http://aappolicy.aappublications.org/cgi/content/full/pediatrics;115/2/496 
Post-Partum Depression http://www.uppitysciencechick.com/ 
KellyMom http://www.kellymom.com/
Jack Newman http://www.breastfeedinginc.ca/
Common Sense Breastfeeding http://www.normalfed.com/
Low Milk Supply http://lowmilksupply.org/
Oral issues (tongue-tie, dental caries, etc) http://www.brianpalmerdds.com/
After breast surgery http://bfar.org/
Adoptive breastfeeding http://www.fourfriends.com/abrw/
Safe Sleep http://nd.edu/~jmckenn1/lab/
Thomas Hale (medications) http://www.infantrisk.com/
Hospital protocols http://www.bfmed.org/default.aspx
International Lactation Consultant Association http://www.ilca.org/i4a/pages/index.cfm?pageid=1
The United States Breastfeeding Committee http://www.usbreastfeeding.org/
Not on the list, but includes Laid Back Breastfeeding http://www.nancymohrbacher.com/