There is a really excellent review article in today's BMJ about breastfeeding.
I strongly urge all HCPs to seek it out and give it a read. It is especially useful in explaining and quantifying the relative benefits of BFs. Also good to note that the WHO growth charts are going be used as standard come 2009.
I've just read it in the bath after BFing 4 month old ds, so feeling very virtuous!