I have had an Canon EOS Digital Rebel XT http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&fcategoryid=139&modelid=11154 since about 2003 or 2004, back when they were like $1,200 compared to about $450 today! I have always shot in the largest JPEG setting, but I am not sure if I should switch to RAW. I really don't know what the difference is between the two. Can you please tell me what pros/cons are to the switch? I only use iPhoto now, but maybe down the road I will get Aperture. I also plan to get Photoshop CS4 or Design Premium Suite CS4 soon, if this makes a difference. Thanks for your help!