S.W.
I can think of several weaning strategies to suggest to you but my very best idea is to contact your local La Leche League Leader and ask to borrow some books from their group library. "Mothering Your Nursing Toddler" is a fantastic resource, and details how to wean or how to keep nursing a toddler. "How Weaning Happens" is also great, with lots of info about gentle weaning techniques to keep mom and baby happy and comfortable. "Taking Charge of Your Fertility" has details about lactation and fertility, and "Adventures in Tandem Nursing" is about nursing two babies who are not twins. (I realize that's not exactly what you asked about, but I thought you might be interested to know it's fine and healthy and does not always interfere with fertility, especially beyond the first six months.)
If you are struggling with biting, you should be able to find info at www.llli.org or by talking to your local Leader. All La Leche Legaue services (phone help, fun meetings, lending library) are free. It's OK to nurse a child who has teeth. I think nursing is a mom's first opportunity to teach her baby manners, and there are several ways you can discourage the nipping--my favorite is to push Baby into the breast when I feel him start to clench, so that he has to release to breathe freely. It takes only a second, so don't think I'm sadistic! ;)
You're right that you'll have to wean to something, whether that's more food or extra snuggles or whatever.
There is new info about storing human milk at www.llli.org, or you might look into www.milkshare.com.
It's nice to remember that weaning is a process and you're already doing it. The moment your baby takes a bite of something besides your milk, you're on your way to weaning. Gradual weaning is not at all painful or distressing. If you want to speed it up, I really recomend those books--they are treasure troves of info I could not find anywhere else and I was relieved to find weaning advice that was gentle and respectful to my baby.
I have a freind who says the word "wean" comes from the same Latin root as the word for "ripening." So she thinks babies are like fruit on a tree--and the mom is the tree. If the baby is "ripe" and ready to wean, it comes off the tree/mom with just a gentle tug. If he's not ready, he'll cling and cling and it will be traumatic to pull the baby/fruit away. This means nursing is still a legitimate need and it would be harder than it's worth to eliminate it. (Personally, nursing into toddlerhood has saved me from dealing with a million tantrums because I had a sure-fire cure-all ready to soothe my baby!) Only you as the mom can know what's best and evaluate how your baby responds.
Congratulations on nursing for a year! You and your baby will reap the benefits of your breastfeeding relationship for the rest of your lives! Your future baby is also lucky to come to such a responsive, sensitive mom! Best wishes!