OFFICIAL PAGE: DrumExtract
DrumExtract, from YellowNoiseAudio, is a plugin that extracts and separates percussive content (e.g. drums) from an audio mix. It is available as a VST plugin (32 & 64-bit) for Windows and as a VST and Audio Units plugin for the Mac. The developer clearly states the limitations of the plugin on their website but it should prove useful for some source material, particularly when used in combination with other applications and plugins.
Screenshot courtesy of YellowNoiseAudio