I usually resize my photo's in Photoshop Elements. I find that 640 pixels across is a good size for emailing folks, as the file size doesn't choke the email server.Originally Posted by dkpbxman
As PhotoJohn said, anything up to 800 pixels will display the entire image on the average computer screen.
Also, check your camera's manual, and see if there is a way to change the size of the image you shoot. It's a lot easier (read quicker) to shoot at 640 pixels, than to resize them later.