I shoot with a Canon EOS 5D Mark II full-frame pro digital camera, equipped with a Canon E6-BG Battery Grip.

I try to use Photoshop very minimally.  I only use it to make minor corrections, such as deleting those pesky dust spots on images and other such things.  I never use Photoshop for things like inserting interesting clouds on images where a plain blue sky is present.  I take pictures with the intent to show a scene exactly like I saw it at the time of capture. I also use it to apply various digital filters (see the next question).

I use Photoshop to apply digital filters and presets made by third-party companies.  These include Nik Software Silver Efex Pro, Nik Software Color Efex Pro 3.0, and onOne PhotoTools 2 Professional, among others.  I also use Alien Skin Software Exposure 2 to simulate the effects that would result from shooting with various film types. As an example, I use this software to simulate the effects of Fuji Velvia 50, a film that is very popular with landscape and nature photographers for its ability to produce deep, rich and vivid colors.  

Specifically I use a Canon EF 24-105mm f/4L IS USM, a Canon EF 16-35mm f/2.8L II USM, a Canon EF 70-200mm f/2.8L IS USM, a Canon EF 100mm f/2.8 Macro USM, a Canon EF 24mm f/1.4L II USM, a Canon 15mm f/2.8 “Fisheye” and a Canon Extender EF 1.4x II.

A tough one to answer at that.  If I had to pick absolutely one, it would have to be my Canon 16-35mm f/2.8L. It’s a wide-angle, and one of the best lenses for shooting landscapes.  The images produced by it are nice and crisp.  Having zoom capabilities is nice too.
Other favorites: The 15mm “fisheye” is also a fun lens.  The 70-200 2.8L is a very versatile lens. 

Mac.  Hands down.  I went all Mac in 2008, and once you go Mac, you never go back. 

I use a Mac Pro for processing, and a G-Technology/Hitachi G-Safe Raid 1 file storage solution.  I also use a Wacom Intuos 4 pen tablet to aid me in my editing/processing.

I own a wide variety of bags (big and small) made by manufacturer ThinkTank.  I am a huge fan of their bags, and I always take my camera along in one of their bags that I own. 

A GPS device, a bubble level, some hex tools, rain protection cover, extra memory cards, lens and camera cleaning supplies, etc…

3,322 to be exact.

I do not use them all.  I always take more pictures than necessary because it increases my chances of coming home with something good. 
I use the very powerful and somewhat simple photo library software called Adobe Lightroom 2 to keep them all organized. 

I’ll just list all of the tripods, heads, brackets, etc… that I own and use.
- Induro CarbonFlex 8X CX214 Tripod Legs
- Giottos MH 1301 Socket & Ball Head
- Gitzo GT-1541T Traveler 6X Carbon Fiber Tripod Legs
- Gitzo GH-1780QR Center Ballhead with Quick Release
- Really Right Stuff BH-40 LR Mid-sized Ballhead
- Gitzo GT-3541L 6X Carbon Fiber Tripod Legs
- Really Right Stuff BH-55 LR Full-sized Ballhead
- Gitzo GM-2541 6X Carbon Fiber Monopod
- Really Right Stuff MH-01 Pro Hi-Capacity Monopod Head (with B2 Pro II Clamp)
- Really Right Stuff BGE6-L: L-plate for Canon EOS-5D Mark II w/ BG-E6 grip
- Really Right Stuff L84: Lens mount support plate for Canon EF 70-200mm f/2.8L IS USM

I read Outdoor Photographer, National Geographic, Nature Photographer, and Shutterbug Magazines. 

Ansel Adams