ADT does offer the cameras as well, but they charge an extra monthly fee for that part ($5). You can do the cameras yourself with something like a Linksys IP camera (http://store.linksys.com/cameras/linksys-WVC80N_stcVVproductId84737621VVcatId554678VVviewprod.htm).
Hmmm. If you can monitor it, so can others.