Of course, La Leche League is a great place to start to get information and support regarding breastfeeding (http://www.lalecheleague.org/) —- listed on LLL’s site are links to other useful sites (www.llli.org/links.html?m=0,4)
Through compilation from other moms, these other sites have some great informatioin:
http://www.askdrsears.com/
http://www.kellymom.com/
www.promom.org/101/