From Show Your Photos:
Adwords Exact File Resizer resizes image files to exactly or very near to 50Kb or to another setting requirements of Banners, Adwords and other graphic advertisements on the internet. Crop and or resize the images to the exact pixel sizes for squares, Leader Board, Banners, Small Square, Sky Scraper, Large Sky Scraper, InLine, Small Square. Prepare images for advertisements with Google and other search engines. This version is the first release on CNET Download.com.