iZotope's Iris software is a sampler with a difference. As well as allowing you to load in samples and manipulate them, Iris is also an amazing tool for sound designers, as it allows you to pick out the exact elements of a sample that you would like to hear and eliminate others. It does this using an intuitive draw tool. It's probably best to see it in action in order to fully understand it, so check it out in the video below!
From now until the end of November 2013, you can grab Iris for just £119 (usually £155)!
Of course, there's much more to Iris too, with built-in effects, the ability to layer sounds and an included 4GB library to get you started.