Another iPhoto enhancement that again sounds like it could be useful, especially the resizing bit. I did follow instructions a while back to try an set up an Automator script, amazingly it worked but the Automator application remains a complete mystery to me.
iPhoto Batch Enhancer is designed to make your life with iPhoto even more comfortable. It helps you apply the built in iPhoto effects (enhance, black-white, sepia and more) with a few mouse clicks to a batch of photos. Additionally you can perform changes to the Adjust palette as well as scale or rotate your photos. The application is localized in English and German.