From The Professional Developer:
TPD Picture Resizer puts you in command of your pictures. Resize those images all at once, or one by one, allowing you to send those images to family and friends with ease. With TPD Picture Resizer you can make your images smaller or larger (if you have small images), change picture dpi for higher quality prints, play around with smoothing modes plus many more options. Resize digital photos by percentage, pixel or aspect ratio. It preserves original digital photos. Specify smallest size limits, so your pictures do not get accidentally resized smaller than you'd like. Picture window, so you can watch your digital photos get resized.