Picasa Web Albums is a free photo-sharing web app site by Google that allows you to organize and edit your photos online and share them with your family and friends. It also has a native application for your desktop so that you can easily upload new photos.
It gives users two methods to upload photos. One is to upload from your browser, and the other is by Picasa (desktop application). Another method I found to upload photos is by email. You can upload new photos by email in whatever you album you want.