Is there a particular photo you have in mind? I don’t fiddle too much in post-processing, I’m really conscious of not over-doing it. I once wrote about my basic image editing process in Aperture to give a photo ‘pop’, but for those with different tones I play around with curves, layers and opacity in Photoshop (I’ll go over this in more detail in the future seeing as a couple of people have now requested it).
For a photo like this, I made minor adjustments to contrast, saturation etc in Aperture — really simple. For this photo, I took it into Photoshop and played around with curves and different layers (What is it with me and dogs?).