Here’s a cool free Windows program called JPEGCrops that will let you batch-crop your photos while maintaining the aspect ratio. This sure beats editing each photo one by one with Photoshop.
JPEGCrops is a Windows program, created for preparation of a batch of images for printing. It provides lossless cropping with fixed aspects using jpegtran.
The program is freeware for private use and is localized to danish, english, finnish, german, polish, portuguese, galician and japanese. Partly localized to czech, dutch, french, hungarian and italian.