Here is a list of what I carry, and what I leave at home:
Camera bag: LowePro Photo Trekker AW photo backpack with a large padded lens case on the side. I also have my tripod mounted on the side. This is a big bag, and I tend to overload it, usually to 30-35 lbs. The AW stands for all weather, because it has a water-resistant nylon cover stored in the bottom. I also have a big Tamrac shoulder bag for when I have to wander around a lot and need more than my pockets will hold. When I don't have a bag, I keep a couple rolls of film in my right pocket, along with the 24mm lens and either the tele-extender or macro tube (see below).
Tripod: Bogen/Manfrotto 3205 legs and 3030 pan & tilt head with quick release plate. Someday I'll get a sturdier 'pod and ball head, but this setup is light.
Canon EOS-5 (the European version of the A2E), with vertical grip and big eyecup for glasses. I like this camera. It feels good in my hand. The eyecup is essential, as strong back- or side-lighting can illuminate the eyepiece and lower the exposure. They eyecup blocks the light very nicely. Fitted with a grid focusing screen to help me get my horizons straight. I carry an angle finder (adaptable to the Rebel also) when I have to get a crazy camera angle which prohibits me from using the viewfinder in the usual manner; a very nice thing to have around.
Canon Rebel 2000, my first camera, is my back-up body. It doesn't expose as well as the EOS-5, but it's battery lasts forever (60-80 rolls, compared to the EOS-5 20-30 rolls).
Kiev 88 medium format camera. Bought it used, in slight disrepair. It's basically a junk camera to learn with, but I got it with four lenses, so it was a bargain to me. I also carry 6x6 back a 645 backs. I don't carry the prizm finder: it's too heavy and the meter is lousy.
My latest acquisition is my best: a Graflex Super Graphic 4"x5" press camera. Very fun to shoot with. I only have one lens, the Graflex Optar 135mm f/4.7.
For the Canons: Canon 70-200mm f/2.8L, my main lens, is sharp, fast, and easy to use. I love it. Sadly, it draws a bit too much attention while shooting activities. Most of my pictures are shot with this. I have the accompanying 2x tele-extender for when I need to really zoom in (kind of unsharp, though, when I use it). My Canon EF 24mm f/2.8 is my wide-angle lens. I like it a lot, but the ergonomics are a bit old-fashioned. The normal lens, Canon 50mm f/1.8 is the cheapest lens Canon makes, but it sure is worth the money. I also carry a Canon 25mm extension tube for macro work. I lose some brightness by using the tube instead of close-up lenses, but it's a better image.
For the Keiv, I have Russian lenses of various manufacture: 80mm f/2.8, the stock lens, is very good, and the lens I prefer. It's multicoated, sharp, and easy to use. My wide-angle is a 45mm f/3.5 is fairly sharp, easy to hand-hold. I have a heavy, beat-up 150mm f/2.8 portrait lens that isn't too sharp (good for those unsharp portraits so popular in the '70's). And lastly, in the side-pocket, a 300mm f/4.5 long lens (note, this is a true 300 mm focal length lens, not a telephoto), which is manual only (I have to set the aperture before the shot, something I frequently forget to do).
Flash: Canon 380EX, good for the EOS-5, even better for the Rebel (the Rebel uses a pre-flash to get exposure, a more accurate method than watching the film and turning the flash off when the exposure is sufficient, as done by the EOS-5).
Other stuff: I have release cables for all bodies, a penlight, a pen and notebook, lens-cleaning stuff, the Kodak Professional Photoguide, and extra body caps.
Film: for types, see the film page. I usually carry 20 to 40 rolls (39 as I type this) of various types, changing somewhat according to the expected brightness outside.
Filters: I carry one: a circular polarizer. I have many others, but found I use them very rarely. I may get a nice ND grad someday.
Stuff I keep at home: some old lenses (Canon EF 75-300mm III telezoom, Canon 28-105mm main lens, Canon 28-80mm default lens, and those stacks and stacks of filters.
Since I've started doing B&W, I now carry a Sekonic 508 light meter. Expensive, but powerful. If this meter had more sensitivity and a display in the viewfinder, it would be perfect.