Shutterfly has a share site capacity now. I post pictures there and you can grant access to people, they can order your photobooks (yay! now I dont have to buy them for the gpts, I send them there and if they want them they can pay for them), pictures etc.
Go to shutterfly.com and then select the Tab for "Share".
Between my brother and parents, we use picasa. We share the password, but apparently you can give permission to users.
http://picasa.google.com/support/bin/answer.py?hl=en&answer=39513
Picasa is free till you hit a certain size limit. We upgraded ours due to the high resolution and volumes. ( bro and I love our nikons!)
My parents love downloading entire albums!