Flickriver is a web-based Flickr viewer that allows viewing hundreds of flickr photos quickly and easily, in one seamless "river of photos" view, never needing to hit next to load the next page. It also allows you to display the photos in larger size than normally seen on flickr. Flickriver is focused on providing a seamless and fast photo viewing experience, keeping visual overload to a minimum.
The lens view feature allows you to look at all flickr photos shot with a specific lens.
Or you can point it at the PhotographyForRealEstate flickr group and view the photos in a continuous stream of large photo. A nifty little site.