Photo Gallery Viewer by Julio Rodriguez is an online tool for viewing web Photo Galleries from Flickr or Picasa (Web Albums).
The photos are presented in a unified and easy to use interface. Its built using the Flickr API that comes with SWX, and SWXml to incorporate data from the Picasa API.
I’m after a very similar thing to this although all my images are hosted with photobucket, although this does look good and might have to migrate to Flickr.