Picasa It's free and easy and it won't move your original. Requires exporting to a folder. (be sure to rename or it will change your original)
http://www.filehippo.com/download_picasa/ Clicky for Picasa
VSO resizer is a one click FAST way to do it... by right clicking your mouse. It shows the size in the file name it creates for the picture.
http://www.vso-software.fr/products/downloader/vso-downloader.php VSO clicky