I am allways afraid how much people don't know how much information are in there pictures.
With Vista you can see a little bit of them if you go to properties (eigenschaften) and than the tab details or if you have XP you can download a exifviewer-with them you see all the informations where you write about...
I use photofiltre portable,with this programm you can select if you want saving your picture with or without the exif(meta)data...