A little heads-up for Apple OSX users who have lots of images to resize. There’s a free tool available to do this at http://www.eagle-of-liberty.com/resizeemall/. It’s donationware, if you like it you can send the author money by paypal.
I’ve used it, and it works as advertised. Drag a bunch of images on the application, and batch-resize them without touching your originals. You can save the images with a postfix, and even in a different format if you like. Very easy for mailing a bunch of photo’s.