I'm a big fan of Picasa from google, it's free and easy to use. It also doesn't change the original file. Just open the folder, highlight the pics you like and export them to a folder on your desktop, using the resize option to pic the size you want the longest side.
I understand a program called Fastone does this too.
You should be able to set the camera to take small files directly without needing to process them at all. "small" may be relative though.
Dave
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