Canon Digital SLR Cameras will take pictures in a 3:2 aspect ratio.
Naturally, I would think that if you need to crop out the pictures, you would do it at a 3:2 aspect ratio as well.
I ran into a photographer who told me he always crop his pictures and deliver it to his client in a 4:3 aspect ratio, the same as P&S cameras. His claim is that it is "industry standard" and that it is easier for the customers because they are already used to printing 4:3 pictures through Costco, Walmart, etc.
So this leads me to wondering and wanting to know what aspect ratio most of you deliver your pictures in?
Also, if you are a photographer who provide high-resolution images, what does that mean to you?
For me, I downsize all my images down to 3504 x 2336 (8 megapixel), regardless if I'm shooting with a 1D Mark IIn, a Canon 50D, or my Canon 5D. I consider that to be "high-resolution" in today's standard still. If I have to crop, I also crop to 3:2 aspect ratio. That way, all of my images are consistent.
Any other photographers care to chime in?