A presentation at the recent “Members Present” evening by Tony Maynard-Smith, aimed at explaining what Photoshop will do that other tools such as Lightroom or Picasa won’t, and to outline some of the basic tools available.
Lightroom for example is a great tool, and does everything one needs on the majority of shots, but after a point one needs something different. Whether your style of photography passes that point is for you to decide.