Hardware; Unibody 15" MacBook Pro with a 2.4 GHz processor, 4GB RAM, 500GB 5400rpm harddrive and I also use my Samsung T260 monitor. I also have the Mighty Mouse, but so far I haven't found it too good for editing. Maybe I'm not used to it enough yet, but whenever I edit pictures, I take out my Logitech v470.
Software; I use Aperture 3 for the majority of my editing, but I'm planning on finally using my copy of Photoshop CS4 soon, but don't want to invest too much time into it now, cause I have exams coming up soon.
Overall, the experience is really good. I love the 15" screen, much better than the 13" MacBook I had before, yet it is still practical enough. I also love how it has 2 graphics cards, it really does help the performance when I'm editing on my external monitor (which doesn't happen all too often, I mostly have my PS3 turned on on it
so much for preparing for exams).