Simple Slideshow For Flickr Images – Flickrshow
It has the ability to display images of a specific user, set, group, gallery and/or tags.
The number of images to be shown "per page", autoplay being on/off, user control being on/off and the interval between each item can all be defined.
There are also callbacks on every level (onLoad, onMove, onPause, onPlay) for customizing it more.
P.S. Flickrshow was shared at WRD long time ago and, since then, it has changed a lot and deserves a 2nd attention