M.L.
I would recommend www.shutterfly.com like a couple of the moms below. My husband I use it to upload and share our photos, order prints, make albums, and order photo gifts. We have over 2,000 photos uploaded onto it and it is 100% free to use their site. We have ordered a ton of prints and photo books from them and their quality is amazing. We previously ordered photo books (albums) from 2 other sites (kodakgallery.com & photoworks.com) and Shutterfly had the best quality without a doubt. We have gotten some of our family members to use Shutterfly as well and now when they do and share photos with us, we just add them to our account and can use them as our own.
By the way in case you are interested in creating photo books, Shutterfly has a ton of different backgrounds you can use for each page, different layouts and even various borders for each photo. They also offer a program you can download for free that makes it easier to upload photos onto their site. You can do it without signing in and after you have selected all the photos you want to add, just click upload and it will get you to sign in and then you can walk away from your computer and it takes care of uploading your photos. We usually upload a couple hundred at a time and do it before going to bed. We wake up the next morning and all the photos are in our account. Check it out if you get a chance and let me know what you thought if you do.
-M.