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You can make Automator scripts that can resize. Very convenient, as you just have to use a contextual menu on the images. You should be able to find some on the Apple Automator site: http://www.apple.com/downloads/macosx/automator/
Preview.app can crop too.
If you want an app, I'd recommend Seashore; it's based on Gimp but looks nicer. Also free.