For those taking photos or just uploading/sharing photos, here are some programs I have found useful. These are all PC based programs.
GIMP: This is a free image editor, often used as an alternative to purchasing Adobe Photoshop.
Shrink O’Matic: This program makes batch resizing and compressing images a simple drag and drop affair. I recommend installing this version and it requires Adobe Air to be installed in order to be able to install the .air file. Once downloaded and with Adobe Air installed you can right click the .air file and choose install in the pop up menu.
RIOT: This is an alternative to Shrink O’Matic and provides the same features.