A lot of these are mother to mother as opposed to professional sites so 
not sure how useful they will be for you:

http://www.llli.org/

http://www.kellymom.com/

http://www.kathydettwyler.org/dettwyler.html

http://www.who.int/childgrowth/standards/en/ (for appropriate growth 
charts for BF babies)

http://www.wiessinger.baka.com/bfing/breastvbottle/wean.html

http://neonatal.ama.ttuhsc.edu/lact/

http://www.nlm.nih.gov/pubs/factsheets/lactmedfs.html

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