I just wanted to put this info out there since we're all getting really close to milk-making time :-) There are organizations that facilitate the donation of breast milk (or you can find a milk donor for FREE through these orgs if you need supplemental milk). It's all based on informed consent- if you are a donor there is no risk to you, you just work out an arrangement with your milk recipient. They might ask personal questions about drug/alcohol use, diet, lifestyle, disease history, etc. They might even want copies of medical records that show you are not carrying diseases that could be passed along in the milk. Every recipient has a different comfort level, and you can opt out at any time. If you need milk donations, it's up to you what kind of info you want and what your comfort level is regarding your donor's health and lifestyle.
Here are the sites:
http://www.hm4hb.net/ (they have local facebook pages to set up local matches as well)
You can also contact your local La Leche League.
I'll be helping a mama of surrogate twins by donating my extra milk (I'm assuming I'll have tons of extra based on my first experience, but we'll see how it goes). I'm really excited! Please consider helping if you find yourself with extra milk, and if you are in need of supplemental milk I hope you'll consider breast milk from a donor for your child!