On any individual picture add " /surf " to its hyperlink. For example the picture below is in "regular mode":
And the next picture is in surf mode. Here you can view five photos in a stream at one time with the middle being larger. You will notice a "skip" hyperlink at the bottom of the far right and far left photos. When you click on the skip hyperlink, it skips to the next five photos in the photostream.
To get to the surf mode, you simply select a single photo in your photostream and click on it. Then add "surf" to the end of the hyperlink in your browser and hit enter. Here's an example photo hyperlink for you:
Regular Mode http://www.flickr.com/photos/evansfam/522754523/
For a complete listing of flickr hacks and tools CLICK HERE