Decrease your bandwidth usage and save yourself some editing time with Smush.it, a web-based image optimisation service. Although designed with web site optimisation in mind, Smush.it doesn't discriminate. Dump a bunch of images in, and smush.it shaves them down. The service strips metadata and recompresses the images to decrease the file size, while its compression algorithm does an excellent job preserving image quality with little to no visible artefacts. Smush.it supports bulk upload, and can also pull images directly from a site. It also has plug-ins for both Firefox and the Wordpress blogging platform. If disk size isn't so much an issue as the dimensions of the image, check out two great programs we've reviewed for some quick and dirty cropping: IrfanView and, my personal favourite bulk cropping tool, JPegCrops. The web-based service and extensions are free, no sign-up or registration required.