Santosha wrote: Aperture and Photoshop are not competitors..Apple Aperture and Adobe Lightroom are.
Lightroom hasn't been released yet, and Arperture does a lot of things Adobe's Photoshop does, especially in the area of digital photography/digital darkroom.
I agree with Santosha, Photoshop is very different to Aperture. Aperture's main competitor is undoubtably Lightroom.
See for yourself: