Xee is a very comfortable image viewer and -browser for Mac OS X. You can open any picture in your index and with the mouse or the arrow buttons, open every picture separately in the index.
See uses OpenGL for the representation. Therefore, scrolling and zooming can be done quite soft - no moving, you can turn, cut, delete or rename the images, or open them in an editor of your choice.
The program can open all file formats supported by Mac and Quicktime, including JPEG, PDF or Quicktime movies.