PicasaWeb From Google

PicasaWeb, from Google, is a free photo publishing/hosting service that works with Picasa, the graphic cataloging and manipulation program also from Google. The website says:

• Post photos and videos online in seconds
  One-click web upload directly from Picasa, or add photos using a web browser or your Mac.
• Share photos with friends and family
  Share albums exclusively with friends and family, or make your albums public and share with the Picasa community.
• View and save your friends' photos
  Keep track of your favorite people and see when they add something new. Download friends' albums too.
• Enjoy photos at their best
  See big photos, scroll through them quickly, rotate and zoom. Have fun with captions and comments.