If you're looking to resize a digital photograph, graphic, logo, etc., one of the easiest solutions is to use the PicMonkey website. This site provides a free and very simple interface for uploading your image and then making whatever changes are needed or desired.
In addition to basic resizing, cropping, etc, you can also add some neat features, like borders, shadows, and the like.
So - go directly to www.picmonkey.com and start in. OR - if you'd like to first view a brief introduction and training video, we've produced one here.