GWTPhotoAlbum is an AJAX photo gallery and slide show with the following features:

• supports automatic resizing of images if the browser window is resized
• supports different size version of the images, conserving bandwidth on small screen devices!
• supports display of captions
• different layouts for the slide show part, e.g. fullscreen, filmstrip (see the example) or embedded in an existing html page
• easy creation of GWTPhotoAlbum web galleries through a GUI front end

See an example here:

http://www.eckhartarnold.de/apppages/GWTPhotoAlbum/BayreuthAndAbroad/index.html

NEWS (May 17th 2012): The KDE imaging plugin (beta) is ready. Get the sources tar-ball kipiplugin_webslideshow-VERSION.tgz in the downloads section!