Keeping an eye on your home whilst away is simple. Just hook up some webcams (even IP cameras) and leave Webcam software
running. You can control the cameras in your house and you can relax in the knowledge that should anyone break in you'll instantly be alerted with recorded video uploaded to youtube.
Do you have any suspicions about your nanny? You could setup Webcam software
to monitor webcams in your home and trigger recording the video and starts screaming.