Heart of Noise Software has released GalaXynth, a "workstation" style instrument for Mac and Windows. Using "Auditory Synthesis", based on how human hearing works, it is designed to create a variety of acoustic and synthetic sounds, while still maintaining the tweakability of traditional synths. GalaXynth employs a 2D surface control where sounds can be morphed, rotated or laid out across the keyboard.
Price: $99+VAT.