My first photo, taken with a Kodak Baby Brownie when I was 12, was of Puddles the hippo at the San Francisco Zoo. Next when I went on a 3-month motorscooter (Lambretta) trip through Europe in 1957 was a Rolleicord (cheap version of Rolliflex). I spent 2 years in the USAF in '58-'60 as editor of a base newspaper (Sembach AFB, near Kaiserslautern, Germany) and the secret service had a Leica they weren't using and let me borrow it. (There's just something unique about those black and whites.)
Next in the early '60s I got a Nikon 35mm, then a Nikkor. I shot '60s culture, and always, buildings. Then along came the Olympus OM-1. It was 50% smaller than the Nikons, with equal lens quality, and I ended up with a full arsenal of OM-1s and lenses.
Next, in more or less order:
•Canon digital camera that focussed on what your eye was focussed on. Don't recall what it was called. Kinda weird.
•Canon 20D, one of my camera sweethearts. Big bodied and worth the weight.
•Panasonic Lumix G1. Pretty much the same way the OM1 overtook the Nikons, this camera cuts way down on the weight of the gun-slinger Canons and Nikons. There are compromises, the worst of which for me is shutter lag, but still it's so much lighter if I'm going anywhere on an airplane.
•Canon Powershot S100, a wonderful little pocket camera.
•GoPro Hero Helmet movie camera, this was a revolution in affordable sports filming
•Sony Cybershot DSC TX7 that shoots kinda weird panoramas
I have a fireproof cabinet full of 30+ years of negatives, and maybe 30-40 binders of film as well as digital thumbnails (I print everything out, 20 per sheet of paper).
Whoops! By this time I had faint recollections* I'd said all this before, and lo, here's what I wrote barely 6 months ago: http://lloydkahn-ongoing.blogspot.com/2011/11/camera-talk.html#more
*Hey (and I've probably written this before too): your memory isn't infinite, right? So as you get older your brain has to jettison stored data to make way for the new. Right?