XbmcCover (Video thumbnail plugin)
Source (required if based on other people's work):
Plugin for KDE file managers (Dolphin and Konqueror) to view movies, with a cover, using the information you have stored Xbmc (.xbmc/userdata/Thumbnails/Video/). In a future version, will use \"Nepomuk\". You need to install Xbmc and get the covers of the movies.