My wife and I have been using Walgreens online photo storage.
https://www.walgreens.com/login.jsp
Unlimited photo and albums. Can save, sort etc. as Ben described. Easy enough to use and fits what we need. Never tried posting a direct photo link though.
Oldest son's first truck:
http://photo2.walgreens.com/walgreen...AME=walgreens/
Seems to work?