IMDb link transformer adds to your movie review many useful information parsed from www.imdb.com. Cache, widget, admin options.
Have a look to the changelog to discover what amazing functions have been lately added.
But broadly speaking:
Changed the way to use highslide js (on WordPress request, piece of code not GPL compliant); it is mandatory now to download the library from IMDBLt website in order to get this damn cool window. Once the file downloaded, put the folder "highslide" into the "js" one and check general options in order to activate it